Logical Fallacies
A practical logical-fallacies reference with clear explanations, usable examples, and teaching tools.
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The argument fails because its internal structure does not validly carry the premises to the conclusion.
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The mistake lies in how evidence is gathered, weighed, interpreted, or treated as sufficient.
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The error concerns what caused what, what explains what, or how a process is supposed to work.
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The reasoning misuses rates, probabilities, samples, distributions, or other quantitative expectations.
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The problem is driven by wording, ambiguity, definitions, or verbal framing rather than sound reasoning.
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The claim is distorted by bad categories, rigid framing, or confused conceptual boundaries.
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The argument draws the wrong lesson from a comparison, stereotype, exception, or generalization.
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The move shifts attention away from the real issue and substitutes something rhetorically nearby but logically irrelevant.
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The argument leans on emotional, social, or rhetorical force where evidence or reasoning should do the work.
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Occurs when someone treats a failure to find expected evidence as if it counted for nothing against the claim, even in a context where the claim should leave detectable t...
Occurs when someone denies the reality or causal relevance of a higher-level pattern just because the pattern is realized through lower-level parts.
Occurs when a model, law, or abstraction drawn from experience is treated as if it were a logically necessary rule that reality cannot ever depart from.
Occurs when someone treats an attack on a person's character, motives, class, or biography as if it were a refutation of that person's argument.
Occurs when a syllogism tries to draw a positive conclusion even though one of the premises is negative in a way that cannot support that conclusion.
Occurs when someone treats an ordinary 'or' as if it were exclusive and concludes that one option must be false because the other is true.
Occurs when someone reasons from 'if A, then B' and then wrongly infers A merely because B is observed.
Occurs when support for part of a view, or problems with part of a view, are treated as if they force total acceptance or total rejection of the whole package.
Occurs when a vivid personal story, testimonial, or isolated case is treated as stronger evidence than broader, better, or more representative evidence.
Occurs when a claim is treated as true or weighty mainly because the person promoting it has impressive accomplishments in some other domain.
Occurs when someone treats an authority's endorsement as if it settled the issue, even when the authority is unqualified, the field is divided, or the claim still require...
Occurs when someone treats the desirability or undesirability of a conclusion as if it were evidence that the conclusion is true or false.
Occurs when a conclusion is pushed mainly by triggering fear, pity, outrage, pride, or hope rather than by showing that the conclusion follows from the evidence.
Occurs when someone tries to secure agreement mainly by amplifying danger, threat, or panic rather than by showing that the conclusion is supported.
Occurs when someone tries to win agreement by flattering the audience's intelligence, courage, independence, or special insight instead of supplying the missing evidence.
Occurs when a claim is dismissed by speculating about the speaker's motives instead of addressing the claim itself.
Occurs when something is praised as good, safe, or right merely because it is called natural, or condemned as bad merely because it is called unnatural.
Occurs when something is treated as better mainly because it is new, cutting-edge, or marketed as the future.
Occurs when sympathy for a person or group is used as if it were evidence that a claim is true or a conclusion follows.
Occurs when a claim is treated as more trustworthy, virtuous, or true mainly because its proponent is poor, ordinary, or from humble circumstances.
Occurs when someone assumes that because something could happen, it is therefore likely or inevitable that it will happen.
Occurs when mockery, embarrassment, or derision is used in place of showing why a view is false.
Occurs when resentment, bitterness, or hostility toward another group is used to drive support for a conclusion.
Occurs when a claim or practice is defended mainly because it has a long history, customary status, or familiar place in a community.
Occurs when a claim is treated as more credible or correct mainly because it comes from a rich, famous, or financially successful person.
Occurs when someone infers that because a particular argument for a conclusion is weak or fallacious, the conclusion itself must therefore be false.
Occurs when someone concludes that a claim is true because it has not been disproved, or false because it has not been proved.
Occurs when someone treats their inability to imagine, explain, or believe a claim as evidence that the claim must be false, or conversely true.
Occurs when repetition is treated as if it adds evidence, wearing down doubt or making a claim seem true through familiarity.
Occurs when a claim is treated as validated because opponents, authorities, or witnesses did not deny it, respond to it, or mention it.
Occurs when agreement is extracted by threat, intimidation, or coercive pressure rather than by showing that the claim is true.
Occurs when a claim is treated as true, reasonable, or justified mainly because many people believe it, share it, or act on it.
Occurs when the wording of a negative position is manipulated so that mere non-belief is treated as if it were the same thing as a strong positive denial.
Occurs when a claim is accepted or dismissed because of some irrelevant association rather than because of the merits of the claim itself.
Occurs when a contested claim is simply asserted, often confidently, without the evidence needed to justify it.
Occurs when someone judges how likely a case is by focusing on vivid case-specific evidence while ignoring the underlying frequency of the thing in question.
Occurs when an argument quietly assumes the very point it is supposed to prove, so the conclusion is built into the premises.
Occurs when a negative generalization about a group is used as if it settled the character or behavior of a specific member of that group.
Occurs when a positive generalization about a group is used as if it established the virtue or competence of a specific member of that group.
Occurs when destruction or forced replacement is treated as an economic gain because the visible spending is counted while the unseen losses and forgone alternatives are...
Occurs when someone selects only the evidence that supports a conclusion and ignores a wider body of evidence that weakens, qualifies, or reverses it.
Occurs when an idea is dismissed mainly because it is old, premodern, or associated with a period that also held many false beliefs.
Occurs when a feedback loop is treated as if it fully explains, proves, or justifies a result, even though the loop may be contingent, breakable, or not sufficient for th...
Occurs when something true of the parts is assumed to be true of the whole they compose.
Occurs when a speaker's certainty, intensity, or felt conviction is treated as if it were evidence that the claim is true.
Occurs when a more detailed scenario is treated as more probable than a less detailed scenario that already contains it.
Occurs when words are selectively excerpted from their original context in a way that changes or distorts what the speaker meant.
Occurs when a claim is rejected simply because the concept involved has blurry boundaries rather than a perfectly sharp cutoff.
Occurs when someone treats a correlation, coincidence, or time pattern as if it already established that one factor caused the other.
Occurs when a substantive question is illegitimately 'solved' by defining one contested concept into another.
Occurs when strong evidence for a phenomenon is rejected solely because the underlying mechanism is still incomplete, disputed, or not yet fully understood.
Occurs when someone tries to protect a claim by insisting that critics must prove the claim false instead of the claimant first supplying adequate support.
Occurs when belief is forced into crude either-or boxes even though the evidence supports a range of confidence levels rather than a single sharp threshold.
Occurs when a hypothetical test case is dismissed as irrelevant merely because it is rare, extreme, or unlikely, even though the principle under debate is supposed to be...
Occurs when someone reasons from 'if A, then B' and then wrongly infers 'not B' merely because A is absent.
Occurs when one side of a genuine contrast is denied or redefined so the opposing term has no place to apply.
Occurs when something true of a whole is assumed to be true of each part or member of that whole.
Occurs when statistics about a group are used to draw conclusions about particular individuals in that group.
Occurs when someone declares an argument false, debunked, or dishonest without identifying the specific flaw that would actually show it is false.
Occurs when the psychological or social effects of believing something are treated as evidence that the thing believed in actually exists or is true.
Occurs when a key word or phrase slides between different meanings inside the same argument, creating the illusion of support.
Occurs when a broad or harmless sense of a word is used to insinuate a narrower, stronger, or more loaded sense of the same word.
Occurs when a word's original or historical meaning is treated as if it controlled the word's present meaning.
Occurs when two negative premises are used in a syllogism even though they fail to establish the positive link the conclusion requires.
Occurs when a conclusion assumes that something exists even though the premises never established that any such thing exists.
Occurs when a question smuggles in one or more assumptions that have not been established, then pressures the listener to answer as if those assumptions were already sett...
Occurs when a condition that is necessary given someone's current description is treated as if it were permanently or universally necessary in the real world.
Occurs when one thing is treated as sufficiently like another even though the comparison breaks down at the point the argument depends on.
Occurs when support for a claim is borrowed from a source that is fabricated, misquoted, unqualified, anonymous in the wrong way, or otherwise not what it is presented to...
Occurs when a dispute is presented as if the competing sides were roughly equal in credibility or evidential support even though the evidence is not remotely balanced.
Occurs when the midpoint between two positions is treated as correct simply because it lies between them.
Occurs when someone presents a limited set of options as if they were the only live possibilities, while reasonable alternatives are ignored or suppressed.
Occurs when two things are treated as equivalent in seriousness, meaning, or explanatory weight despite relevant differences that make the comparison misleading.
Occurs when someone calls for a truce, balance, or 'agree to disagree' posture not because the evidence is genuinely inconclusive, but because their position is under pre...
Occurs when an inductive conclusion reaches further than the available evidence can reasonably support, or ignores information that should limit the generalization.
Occurs when a hypothetical premise is rejected simply because the speaker does not actually believe it.
Occurs when a syllogism seems to use three terms but actually uses four because one term shifts meaning halfway through the argument.
Occurs when someone thinks past outcomes of independent events make a future independent outcome more or less likely than it really is.
Occurs when a claim, practice, or idea is judged mainly by its origin rather than by its present content, evidence, or merits.
Occurs when someone draws a broad conclusion from too little evidence, too small a sample, or a badly skewed sample.
Occurs when people in the past are judged as if they had the same information, background assumptions, and hindsight available to later observers.
Occurs when a mind-like inner observer is smuggled in to explain mind-like abilities, thereby postponing rather than solving the explanation.
Occurs when a human classification, rule, or label is treated as if it automatically determined the underlying fact or moral status.
Occurs when someone uses strategically shifting language that seems to support both sides by quietly changing the meaning of the key term to suit the audience.
Occurs when a syllogism distributes the major term in the conclusion even though the major premise never distributed it there.
Occurs when a view is framed so every possible outcome fits it equally well, leaving no meaningful room for the claim to fail.
Occurs when one option is called better, worse, cheaper, safer, or more effective without specifying the relevant comparison class or the other factors that matter.
Occurs when different comparison targets are used across different dimensions to create the illusion of one all-around winner.
Occurs when the creator's intended meaning is treated as irrelevant in contexts where that intention is actually important to understanding the work or statement.
Occurs when a descriptive claim about what is common, natural, or actual is treated as if it directly established what ought to be done.
Occurs when pejorative, loaded, or insulting language is used to steer judgment in place of actual support for the conclusion.
Occurs when someone assumes that doubling the input will double the output even though the system has thresholds, saturation, feedback loops, or diminishing returns.
Occurs when labor-saving technology is treated as if it must reduce total employment or human usefulness simply because it automates some existing tasks.
Occurs when two names or descriptions refer to the same thing, but a belief or knowledge context blocks simple substitution and the argument ignores that.
Occurs when a striking anecdote or emotionally intense case is used to make a problem seem more common, clear, or representative than the broader evidence allows.
Occurs when someone advances a bold, controversial claim, retreats under criticism to a weaker and easier-to-defend claim, and then returns to the stronger claim as if th...
Occurs when evidence that was supposed to satisfy a stated standard is dismissed and a new, harder standard is introduced so the conclusion never has to be reconsidered.
Occurs when something is treated as good, safe, or morally preferable mainly because it is called natural, traditional, or closer to nature.
Occurs when a claim is treated as true because it has not been disproved, or false because it has not been proved.
Occurs when a realistic option is rejected because it does not solve a problem perfectly or because an imagined ideal is used as the standard of comparison.
Occurs when someone protects a generalization from counterexamples by redefining the group with an ad hoc 'real' or 'true' membership test.
Occurs when a general principle is padded with so many exceptions that it no longer guides action or says much of substance.
Occurs when traits that are often bundled together by stereotype, tradition, or habit are treated as if they must always come as a package.
Occurs when human feelings, intentions, or judgments are projected onto impersonal things and then treated as if the projection explained reality.
Occurs when a useful solution is dismissed because it does not fully solve the problem or because some flaws would remain afterward.
Occurs when a messy range of better and worse cases is collapsed into a rigid perfect-or-failed binary.
Occurs when an analogy is deliberately stretched past its intended point so it can be mocked or refuted.
Occurs when evidence for one claim is illegitimately used as if it also confirmed a second claim that merely travels alongside it.
Occurs when negative framing is introduced in advance so that whatever a person says next will be dismissed before it is fairly heard.
Occurs when someone infers that because one event happened before another, the earlier event caused the later one.
Occurs when one or a few examples are offered as if they were enough to establish a universal claim.
Occurs when a claim is protected by an avalanche of words, side points, jargon, or branching assertions that overwhelm reasonable scrutiny and create the illusion of dept...
Occurs when a low probability of a false match is confused with a low probability that a matched person is innocent.
Occurs when someone projects their own motives, fears, or mental structure onto others and treats that projection as insight into those other people.
Occurs when someone diverts attention from the unresolved issue by switching to a different issue that is easier, safer, or more emotionally useful.
Occurs when someone demands empirical evidence before rejecting a concept that is already incoherent, self-contradictory, or logically impossible on its own terms.
Occurs when movement back toward a normal range after an extreme result is credited to some intervention that may have had little or nothing to do with it.
Occurs when an abstraction is spoken of as if it were a concrete agent or thing in a way that misleads rather than merely using harmless metaphor.
Occurs when, after an outcome happens, people claim it was inevitable or obvious all along even though the uncertainty beforehand was real.
Occurs when a fuzzy, graded, or probabilistic position is forced into unnaturally sharp categories so it becomes easier to attack.
Occurs when the desirability, comfort, or emotional appeal of an outcome is treated as if that were evidence that the outcome is true, feasible, or justified.
Occurs when someone highlights the data cluster that supports a favored story only after looking at the results, then treats that hand-picked pattern as if it had been th...
Occurs when a complex outcome is explained as if one cause alone did the work, while other relevant causes are ignored or illegitimately minimized.
Occurs when someone claims that a relatively small first step will trigger a chain of worsening outcomes without showing why that chain is likely, stable, or hard to stop...
Occurs when someone asks for an exception to a rule or standard but does not provide a relevant reason for why the favored case should be exempt.
Occurs when the most visible or most covered cases in a category are treated as if they represent the category as a whole.
Occurs when an argument becomes so internally tangled that its pieces no longer form a coherent chain from premise to conclusion even though it sounds intricate.
Occurs when someone replaces an opponent's actual position with a weaker, more extreme, or simplified version and then refutes that easier target.
Occurs when the polish, confidence, charisma, or dramatic force of a presentation is treated as if it established the quality of the argument itself.
Occurs when one term in a meaningful contrast is redefined so broadly or so narrowly that its opposing term can no longer do any work.
Occurs when conclusions are drawn from the visible successes that made it through a filter while the failures, dropouts, or non-survivors are ignored.
Occurs when a purpose, goal, or final destination is attributed to something without adequate evidence that such an end point was built into it.
Occurs when a familiar slogan or stock phrase is used to stop inquiry, deflect scrutiny, or create the feeling that an issue has already been settled.
Occurs when a negative trait found in one member of a group is used to condemn the group as a whole.
Occurs when a reasonable generalization is attacked by demanding that it hold without relevant scope conditions or exceptions.
Occurs when a positive trait found in one member of a group is used to justify a positive conclusion about the group as a whole.
Occurs when each new claim is treated as if the relevant history of prior failures, hoaxes, or false alarms did not exist and should confer no default expectation at all.
Occurs when criticism is answered not by engaging the issue, but by pointing to similar hypocrisy or wrongdoing elsewhere.
Occurs when someone treats one wrong act as justified because it responds to, retaliates against, or balances out another wrong.
Occurs when two things are linked to the same broader category and the argument wrongly infers that one of them must therefore be the other.
Occurs when vague, elastic, or undefined terms are chosen so that a position sounds meaningful while resisting clear testing or criticism.
Occurs when a belief or decision is driven mainly by what would be pleasing, hopeful, or comforting if true rather than by what the evidence supports.
Occurs when testimony is padded by unverifiable references to other alleged witnesses, creating the illusion of corroboration without actually providing independent suppo...
Occurs when a real association is noticed but the direction of causation is reversed.
