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genetic_fallacy
The genetic fallacy judges the truth or value of a claim based on its origin rather than its current merit or evidence. Whether a claim arose from a dubious source, an outdated era, or a questionable motivation, its truth value must be assessed on its own terms. This fallacy can work in both directions: dismissing good ideas because of their source or accepting bad ideas because of their prestigious origin.
"That mathematical theorem was first proposed by a known alcoholic, so we shouldn't trust it."
A city council member dismisses a cost-saving proposal: 'This idea came from the intern, not from a seasoned policy expert. We can't take it seriously.' The proposal's merits are never actually examined.
A nutrition blogger writes: 'Big Pharma funded that study on vitamin supplements, so the results showing they're ineffective must be wrong.' The argument attacks the funding source rather than the methodology or data.
Origin(P, source) AND Negative(source) -> NOT P
Binary (yes/no) questions an LLM must answer to identify this aspect:
Does the argument evaluate a claim based on where it came from rather than its content?
Type: binaryIs the origin or history of the idea used to accept or reject it?
Type: binaryIs the actual evidence for or against the claim being ignored in favor of its source?
Type: binaryThe genetic fallacy judges the truth or value of a claim based on its origin rather than its current merit or evidence. Whether a claim arose from a dubious source, an outdated era, or a questionable motivation, its truth value must be assessed on its own terms. This fallacy can work in both directions: dismissing good ideas because of their source or accepting bad ideas because of their prestigious origin.
Source credibility is a useful heuristic in everyday life, so people naturally extend it too far, treating origin as determinative of truth rather than merely suggestive.
Separate the origin of the claim from its current evidence. Evaluate the argument on its merits: 'Where an idea comes from doesn't determine whether it's true.'
Used to dismiss ideas from rival political parties, competing companies, or historically discredited sources, even when the specific idea has independent support. Also used in reverse to accept ideas from prestigious institutions uncritically.
The fallacy fallacy (also known as the argument from fallacy) occurs when someone concludes that a claim is false merely because an argument supporting it contains a logical fallacy. While identifying fallacious reasoning is valuable, a bad argument for a true claim does not make the claim false — the conclusion may still be correct, just not for the reasons given. The truth value of a proposition is independent of any particular argument for or against it.
The etymological fallacy occurs when someone argues that the 'true' or 'correct' meaning of a word is its original or historical meaning, and that contemporary usage must defer to etymology. Language evolves, and the meaning of words is determined by current usage and social convention, not by historical origins. While etymology can illuminate conceptual history, it does not prescribe current meaning, and arguments that rely on etymological authority to settle semantic disputes commit this fallacy.
Ad feminam is a gendered form of the ad hominem fallacy in which an argument is dismissed, devalued, or not taken seriously because the speaker is a woman. The content of the argument is bypassed entirely, and the speaker's gender becomes the (explicit or implicit) basis for dismissal. This can manifest as overt sexism ('she's too emotional to reason about this') or as subtler patterns of discrediting, interrupting, tone-policing, or attributing a woman's position to her gender rather than her reasoning.
Ad virum is the complement of ad feminam: an argument is dismissed, devalued, or treated as inherently suspect because the speaker is male. The fallacy occurs when the speaker's maleness is treated as sufficient reason to discount their contribution — for example, by claiming they cannot understand or speak to a topic because of their gender, or by dismissing their position as an expression of male privilege rather than engaging with its substance. While acknowledging positionality is valuable, it becomes fallacious when gender alone is used as grounds for dismissal.
The circumstantial ad hominem occurs when an argument is dismissed not by attacking the person's character directly (as in abusive ad hominem) but by pointing to their circumstances — their profession, affiliations, financial interests, personal situation, or identity — and claiming these circumstances are the real reason for their position. The implicit logic is: 'You only believe X because you stand to benefit from X, therefore X is false.' While conflicts of interest are relevant to credibility assessment, they do not determine the truth value of a claim, and using them as a substitute for substantive engagement is fallacious.
Use these tools to detect, analyze, or train this aspect.