Tu quoque
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Tu quoque (Latin for "You, too" or "You, also") is an argument that asserts or implies that a certain position is false and/or should be disregarded because its proponent fails to consistently act in accordance with that position; it attempts to show that a criticism or objection applies equally to the person making it. It can be considered an ad hominem argument, since it focuses on the opposite party itself, rather than its positions.
For instance, "Reverend Bob claims that theft is wrong, but how can theft be wrong if Bob himself admits he stole objects when he was a child?"
[edit] You-too version
This form of the argument is as follows:
- A makes criticism P.
- A is also guilty of P.
- Therefore, P is dismissed.
This is an instance of the two wrongs make a right fallacy.
Example:
- "He cannot accuse me of libel because he was just successfully sued for libel."
[edit] Inconsistency version
This form of the argument is as follows:
- A makes claim P.
- A has also made claims which are inconsistent with P.
- Therefore, P is false (or is dismissed).
If the conclusion is that "P is false", then this is a logical fallacy because the conclusion that P is false does not follow from the premises; even if A has made past claims which are inconsistent with P, it does not necessarily prove that P is either true or false. [After all, A might have changed his/her mind.]
Example:
- "You say airplanes are able to fly because of the laws of physics, but this is false because twenty years ago you also said airplanes fly because of magic."
