ad hominem

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An ad hominem (Latin for "to the man" or "to the person"), short for argumentum ad hominem, is an attack on an argument made by attacking the character, motive, or other attribute of the person making the argument, rather than attacking the argument directly. When used inappropriately, it is a logical fallacy in which a claim or argument is dismissed on the basis of some irrelevant fact or supposition about the author or the person being criticized. Ad hominem reasoning is not always fallacious, for example, when it relates to the credibility of statements of fact or when used in certain kinds of moral and practical reasoning.

Fallacious ad hominem reasoning is normally categorized as an informal fallacy, more precisely as a genetic fallacy, a subcategory of fallacies of irrelevance.

Types

See also: List of fallacies

Abusive

Abusive ad hominem usually involves attacking the traits of an opponent as a means to invalidate their argument(s). Equating someone's character with the soundness of their argument is a logical fallacy.

Ad hominem abuse is not to be confused with slander or libel, which employ falsehoods and are not necessarily leveled to undermine otherwise sound stands with character attacks.

Tu quoque

Main article: Tu quoque

Ad hominem tu quoque (literally: "You also") refers to a claim that the source making the argument has spoken or acted in a way inconsistent with the argument. In particular, if Source A criticizes the actions of Source B, a tu quoque response is that Source A has acted in the same way. This argument is false because it does not disprove the premise; if the premise is true then Source A may be a hypocrite, but this does not make the statement less credible from a logical perspective. Indeed, Source A may be in a position to provide personal testimony to support the argument.

For example, a father may tell his son not to start smoking as he will regret it when he is older, and the son may point out that his father is or was a smoker. This does not alter the fact that his son may regret smoking when he is older.

Circumstantial

Ad hominem circumstantial points out that someone is in circumstances such that they are disposed to take a particular position. Ad hominem circumstantial constitutes an attack on the bias of a source. This is fallacious because a disposition to make a certain argument does not make the argument false; this overlaps with the genetic fallacy (an argument that a claim is incorrect due to its source).

The circumstantial fallacy applies only where the source taking a position is only making a logical argument from premises that are generally accepted. Where the source seeks to convince an audience of the truth of a premise by a claim of authority or by personal observation, observation of their circumstances may reduce the evidentiary weight of the claims, sometimes to zero.

Examples:

1. Mandy Rice-Davies's famous testimony during the Profumo Affair, "He would [say that], wouldn't he?", is an example of a valid circumstantial argument. Her point was that a man in a prominent position, accused of an affair with a callgirl, would deny the claim whether it was true or false. His denial, in itself, provides little evidence against the claim of an affair. Note, however, that this argument is valid only insofar as it devalues the denial; it does not bolster the original claim. To construe invalid evidence of the denial as valid evidence of the original claim is fallacious (on several different bases, including that of argumentum ad hominem); however likely the man in question would be to deny an affair that did in fact happen, he is no less likely to deny an affair that never happened.

2. Glassner suggests that Bennett is somehow unqualified to criticize rap music because of positions Bennett has taken on other issues. However wrong Bennett may have been on other issues, such as the funding of public television or illegitimacy, that does not mean that his criticisms of rap were mistaken.

Guilt by association

Main article: Association fallacy

Guilt by association can sometimes also be a type of ad hominem fallacy if the argument attacks a source because of the similarity between the views of someone making an argument and other proponents of the argument.

This form of the argument is as follows:

1. Source S makes claim C.
2. Group G, which is currently viewed negatively by the recipient, also makes claim C.
3. Therefore, source S is viewed by the recipient of the claim as associated to the group G and inherits how negatively viewed it is.

An example of this fallacy could be "My opponent for office just received an endorsement from the Puppy Haters Association. Is that the sort of person you would want to vote for?"

Another very prominent example of guilt by association ad hominem is referring to someone sharing a less politically correct view as a Nazi, a Donald Trump supporter, a "flat Earther", or a conspiracy theorist, regardless of whether they are a National Socialist, a Trump supporter or a believer in the flat Earth theory or not. This fallacy is prominent all over politically correct organizations and websites, such as Wikipedia, Reddit, Facebook, Twitter, YouTube and Quora.

Non-fallacious reasoning

When a statement is challenged by making an ad hominem attack on its author, it is important to draw a distinction between whether the statement in question was an argument or a statement of fact (testimony). In the latter case the issues of the credibility of the person making the statement may be crucial.

Criticism as a fallacy

Doug Walton, Canadian academic and author, has argued that ad hominem reasoning is not always fallacious, and that in some instances, questions of personal conduct, character, motives, etc., are legitimate and relevant to the issue, as when it directly involves hypocrisy, or actions contradicting the subject's words.

The philosopher Charles Taylor has argued that ad hominem reasoning (discussing facts about the speaker or author relative to the value of his statements) is essential to understanding certain moral issues due to the connection between individual persons and morality (or moral claims), and contrasts this sort of reasoning with the apodictic reasoning (involving facts beyond dispute or clearly established) of philosophical naturalism.

See also

• And you are lynching Negroes
• Appeal to authority
• Appeal to motive
• Association fallacy
• Character assassination
• Credibility
• Discrediting tactic
• Fair Game (Scientology)
• Fundamental attribution error
• Gaslighting
• Hostile witness
• List of logical fallacies
• Negative campaigning
• Poisoning the well
• Race card
• Red herring
• Reputation
• Shooting the messenger
• Straw man
• The Art of Being Right

External links

• Ad hominem at PhilPapers
• Nizkor.org: Fallacy: Ad Hominem.
• Nizkor.org: Fallacy: Circumstantial Ad Hominem.
• Argumentum Ad Hominem
• University of Winnipeg: Argumentation Schemes and Historical Origins of the Circumstantial Ad Hominen Argument PDF (70.2 KB)
• Logical Fallacies: Ad Hominem