Ad Hominem: Tu Quoque

11 Ad Hominem : Tu Quoque

George Wrisley

A public school teacher argues for increased pay for public school teachers and a taxpayer attacks his argument by replying, “Sure! It’s easy to see why you’re in favor of a raise!” To which the teacher replies, “Well, I can say the same of you; it’s easy to see why you’re against it!”

Douglas Walton, Ad Hominem Arguments

This chapter deals with ad hominem: tu quoque. Understanding it is easier after reading the general treatment of ad hominem bias, as well as the chapters on circumstantial ad hominem and direct ad hominem.

An ad hominem: tu quoque argument is often seen in political debate. When one party impugns the character of another, it is frequently countered with a response of “you, too!” The surface goal of such a retort is to distract from or deflate the power of the first party’s allegations. However, the tu quoque ad hominem is not merely the claim that the other party is just as guilty as oneself. As Douglas Walton emphasises: “The main problem with the textbook treatment of the tu quoque ad hominem fallacy is that according to the way it is most often defined, it becomes essentially the same type of argument as that in the two wrongs make a right fallacy.” What makes the ad hominem: tu quoque distinct from “two wrongs” is that it necessarily involves both parties’ characters in some way. Walton stresses: “The primary case of the tu quoque type of ad hominem retort occurs when an ad hominem reply is used to respond to an ad hominem attack.” Thus, the ad hominem: tu quoque is itself a counter-ad hominem, and it always connects to one of the other ad hominem subtypes.

More broadly, the tu quoque can also be used in response to any criticism, not only an ad hominem attack. The general structure runs:

1. Person A makes an argument X, or criticises Person B for action Y.
2. Person B responds by accusing Person A of being guilty of action Y (or a similar fault).
3. Person B then concludes that Person A’s argument or criticism is therefore invalid.

A slightly different formulation, often emphasised in more general fallacy treatments, focuses on the inconsistency between a person’s claims and their behaviour: Person A claims X is true (or false) because of reason Y. Person B points out that Person A does not act in accordance with Y, and then concludes that X is therefore false (or true). Both formulations capture the same core error: treating personal hypocrisy as if it logically disproves a claim.

In its most characteristic ad hominem form, the exchange specifically targets the participants’ characters or motives:

Proponent: Questions or attempts to refute respondent’s position x, not by attacking x, but by attacking the respondent’s character directly or by appealing to circumstances or bias.

Respondent: Questions or attempts to refute the proponent’s ad hominem argument by alleging that the proponent is equally guilty in a similar way of having a bad character (Walton 1998, 233).

As with all ad hominem argument forms, the tu quoque has both fallacious and legitimate uses. A main question therefore becomes: How do we differentiate the fallacious from the legitimate instances of this retort? The influence such arguments can have on an arguer’s ability to support a position makes this distinction essential. Fallacious uses are pernicious, in part because they are difficult to answer effectively; it is hard for someone to recover from accusations that paint them as a hypocrite.

To help identify whether an ad hominem: tu quoque argument is fallacious, ask the following critical questions, which combine insights from evaluating both sides of the exchange:

1. Assess the initial attack (if any). If the proponent used an ad hominem, how good is that argument? Is it fallacious? Answer the standard ad hominem questions: How well justified are the allegations? Are the details about the person actually relevant to the position in question? Does the proponent intend the allegations to refute the position entirely, or merely to cast doubt on the arguer’s credibility? An ad hominem that aims at full refutation is almost always fallacious, because a person’s character does not logically determine the truth of their statements. If the aim is solely to question credibility (e.g., a known liar testifying), it might be a non-fallacious relevant criticism.

2. Evaluate the tu quoque response itself. How good is the respondent’s counter-allegation? Is it well-justified? Are the details about the proponent’s supposed guilt relevant to the original criticism or to the proponent’s credibility? The tu quoque is fallacious if it simply shifts the topic without genuinely engaging the proponent’s point or if the alleged hypocrisy is irrelevant.

3. Identify the intended force of the tu quoque. Does the respondent intend the tu quoque to completely refute the proponent’s argument or criticism, or merely to challenge the proponent’s standing or consistency? Pointing out hypocrisy typically has no logical bearing on the truth of a statement or the soundness of an argument. Therefore, if the tu quoque is offered as a refutation (“You do it too, so my actions aren’t wrong” or “Your point is false”), it is almost certainly fallacious. If it is offered only to undermine credibility or to highlight a double standard, it may be legitimate in contexts where the arguer’s integrity is directly at issue—though even then it does not settle the argument’s substance.

4. Consider the credibility of the respondent. If the proponent’s initial argument was itself a good one (relevant, well-justified, aimed at credibility rather than refutation), how credible is the respondent’s counter-allegation? A weak or unsubstantiated “you too” does not cancel out a legitimate criticism of character, and it may itself be a fallacious diversion.

A special case of legitimate tu quoque arises when the arguer’s own claim hinges on their asserted consistency. If a person insists that their actions align perfectly with their stated views—like someone who preaches moral purity while claiming to live that same purity—then exposing their hypocrisy directly refutes that specific claim about themselves. The tu quoque then becomes relevant not to the truth of the general principle, but to the falsity of the person’s self‐description.

To illustrate the fallacious uses, return to the opening exchange between the teacher and the taxpayer. The taxpayer launches a circumstantial ad hominem: the teacher only supports a pay raise because she stands to benefit. That attack does not engage the merits of the teacher’s argument; it merely points to a potential bias. The teacher’s retort — “I can say the same of you; it’s easy to see why you’re against it” — is a classic tu quoque, alleging similar self-interest. Applying the questions: the taxpayer’s initial ad hominem is likely fallacious if used to refute the teacher’s position, because even a biased person can offer good reasons. The teacher’s tu quoque mirrors the same weakness and adds nothing to the debate about teacher pay. Both sides are engaging in fallacious ad hominem exchanges that distract from the substantive issue. The tu quoque here is fallacious because neither the taxpayer’s nor the teacher’s personal stake disproves the other’s arguments, and both retorts aim to deflect rather than engage.

Similar everyday examples abound. Helga tells her friend to eat healthier, yet Helga herself eats fast food daily. Her friend dismisses the advice with “You don’t follow your own advice, so why should I?” The friend’s response is a tu quoque fallacy: the nutritional value of Helga’s advice does not depend on Helga’s willpower. Likewise, a televangelist who preaches against sexual immorality but is caught with a prostitute may be a hypocrite, but that personal failing does not disprove the moral teaching itself—it only shows the preacher is inconsistent. A more positive illustration involves a father who, though a heavy smoker, tells his son never to smoke. The father later dies of lung cancer at 69; the son heeds the advice and never touches a cigarette. The father’s failure to follow his own counsel does not negate its soundness, and the son’s decision to accept the warning while recognising his father’s inconsistency is a rational one, not a fallacy.

A legitimate use might occur in a context where a person’s credibility is the very point. Suppose a political candidate accuses her opponent of taking donations from a polluting industry and argues that this makes the opponent untrustworthy on environmental policy. If it emerges that the accusing candidate has accepted equally large donations from the same industry, a tu quoque response — “You accept the same kind of donations” — does not falsify the original accusation, but it effectively undermines the accuser’s credibility as an impartial critic. Here the tu quoque is not offered to refute a factual claim but to show that the accuser lacks the moral standing to issue such a criticism. In such a case, where the proponent’s original attack was itself a character-based challenge to credibility, the tu quoque may be a relevant and non-fallacious counter-move, provided the counter-allegation is well-supported and the argument does not pretend to settle the underlying factual questions.

In sum, the ad hominem: tu quoque is fallacious when it is used as a smokescreen to avoid addressing the substance of an argument or when it claims that hypocrisy alone makes a position false. It can be a legitimate critical tool only in the narrow space where the participants’ characters or biases are themselves the legitimate subject of dispute, and even then it serves to question credibility, not to establish truth. An honest arguer will readily admit when a lack of personal consistency has no bearing on the truth of the claim at hand, rather than weaponising inconsistency to dodge the real issues.