Explanation
A tu quoque argument answers criticism not by examining its substantive content but by alleging that the critic acts contrary to the demand or has behaved similarly. As a subtype of person-directed argumentation, it shifts attention from the disputed claim to the opponent's credibility. Inconsistency can be relevant when sincerity, equal treatment, authority, or practical feasibility is itself at issue. It does not, however, automatically refute the original norm or factual proposition: a hypocritical speaker may still say something true. The concept therefore separates two questions—whether an objection is valid and whether its proponent lives up to it. Maintaining this distinction prevents legitimate accountability from replacing examination of the matter.
Movement of thought
1. A person first raises an objection or states a rule that should be examined with respect to the issue. 2. The response redirects attention from claim and reasons toward inconsistent conduct or an earlier position of the critic. 3. The audience may consequently reassess credibility even though the original objection has not been substantively refuted. 4. A counter-test asks whether inconsistency bears on truth, normative validity, or only authority and separates refutation from accountability. 5. The debate returns on two tracks: the substantive question and the integrity question can each be investigated with their own reasons.
Scientific use case
Argumentation theory and discourse research code the original thesis, inconsistency allegation, relevance bridge, and conclusion. Experiments test when hypocrisy charges reduce persuasion despite unchanged evidence.
Example
“Your measurements show excessive consumption.” — “You drove yesterday yourself.” The reply evaluates the critic's conduct but leaves the measurements unexamined.
Counterexample
A speaker claims that a rule admits no exceptions but explicitly grants one to herself. Pointing this out directly tests the rule's scope and equal application and need not be fallacious.
Distinction
Distinguish it from ad hominem as a broader family, hypocrisy accusation, anticategoria, antistrephon, whataboutism, relevance argument, legitimate consistency testing, and substantive refutation.
Effect on thought and perception
Tu quoque can deflect criticism, mobilise opposition to perceived double standards, and open legitimate consistency questions, yet it can also displace substantive reasons through personalisation.
Resonance
An accusation misses the thesis and rebounds toward the speaker; only separate lines reveal what touches the matter and what touches credibility.
Cite this entry
Reich, Michael (Hrsg./ed.): „Tu quoque argument“. Atlas der Sprache, AT-088-024. ATLAS 260, data model 1.6.0. https://atlasoflanguage.com/concept/AT-088-024The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.
Historical background
Locke describes pressing an opponent with consequences of their own principles under argumentum ad hominem. He immediately distinguishes exposing the other person’s error from proving one’s own position correct. This gives historical background for tu quoque without making every consistency challenge irrelevant. The Atlas should ask whether a discrepancy genuinely weakens the claim being assessed or merely points to the claimant’s failure to practise it. Someone’s inconsistency may matter to credibility while leaving the underlying proposition true. Locke’s older category is broader than the later specialised label, whose transmission remains to be checked. The witness supplies a precise boundary: showing that the interlocutor is wrong about something does not remove the separate burden of supporting the conclusion one wants accepted.
How conceptual history changes the analysis
Tu quoque evades the substantive issue when it merely exposes the critic’s inconsistency; that inconsistency matters only when it bears on the claim’s evidence or applicability.
References for the historical section
- John Locke, An Essay Concerning Human Understanding, Books III–IV; Project Gutenberg ebook 10616 · Essay IV.xvii.21–22: an opponent’s own principles and the limits of refutation
Selected witness, not a complete genealogy or first English attestation. Contemporary Atlas comparisons are editorial interpretations. Only the named passage of the identified transcription was inspected; philosophical positions remain attributed, not treated as settled empirical results.