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ad_hominem
Ad hominem attacks the person making an argument rather than the argument itself. It comes in several varieties: abusive (direct personal attack), circumstantial (suggesting the person's circumstances bias them), and tu quoque (pointing out hypocrisy). While a person's character or motives may sometimes be relevant to credibility, ad hominem becomes fallacious when it is used as a substitute for addressing the substance of the argument.
"You can't trust Dr. Miller's research on climate change -- she's funded by an environmental organization, so she's obviously biased."
During a debate on tax policy, a senator dismisses his opponent's proposal by saying: 'Why would anyone listen to her? She filed for personal bankruptcy twice — she clearly can't manage money.'
A commenter responds to a nutritionist's article on reducing sugar intake: 'Have you seen this guy's Instagram? He's not even that fit. Why would you take dietary advice from him?'
∀x(Person(x) ∧ HasFlaw(x) ⇒ Invalid(Claim(x)))
Binary (yes/no) questions an LLM must answer to identify this aspect:
Does the argument attack a person's character, motives, or attributes?
Type: binaryIs the personal attack used as a reason to reject their argument?
Type: binaryIs the personal attribute irrelevant to the truth of the claim?
Type: binaryAd hominem attacks the person making an argument rather than the argument itself. It comes in several varieties: abusive (direct personal attack), circumstantial (suggesting the person's circumstances bias them), and tu quoque (pointing out hypocrisy). While a person's character or motives may sometimes be relevant to credibility, ad hominem becomes fallacious when it is used as a substitute for addressing the substance of the argument.
Attacking the messenger is emotionally compelling and shifts attention away from the argument itself. People instinctively weigh credibility, so casting doubt on the person feels like casting doubt on their claims.
Redirect focus to the argument itself: 'Regardless of who is making the claim, is the evidence and reasoning sound?' Separate the message from the messenger.
Standard fare in political campaigns, courtroom cross-examinations, social media arguments, and corporate disputes where discrediting a critic is easier than addressing their criticism.
Positive/negative traits in one area spill over into overall perception.
Positive/negative traits in one area spill over into overall perception.
Expert E in domain S asserts A; therefore A is presumably true.
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.
Reductio ad Hitlerum, a term coined by philosopher Leo Strauss, is a form of guilt by association in which a position is dismissed by linking it — however tenuously — to Adolf Hitler, Nazism, or fascism. The implicit logic is: 'Hitler believed/did X, therefore X is wrong.' While comparisons to historical atrocities can sometimes be legitimate (when the structural parallels are genuine and substantive), the fallacy occurs when the Nazi association is used as a rhetorical bludgeon to shut down debate rather than as a substantive historical analysis.
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.
Dismissing someone's criticism or opinion on the grounds that they lack direct personal experience with the subject ('You've never run a business, so you can't criticize business practices'). A form of ad hominem that confuses experiential knowledge with analytical validity.
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