Fallacy: Ad Hominem Tu Quoque
Also Known as: "You Too Fallacy"
This fallacy is committed when it is concluded that a person's claim
is false because 1) it is inconsistent with something else a person has
said or 2) what a person says is inconsistent with her actions. This
type of "argument" has the following form:
The fact that a person makes inconsistent claims does not make any
particular claim he makes false (although of any pair of inconsistent
claims only one can be true - but both can be false). Also, the fact
that a person's claims are not consistent with his actions might
indicate that the person is a hypocrite but this does not prove his
claims are false.
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Description of Ad Hominem Tu Quoque
Examples of Ad Hominem Tu Quoque
Jill: "Well, I certainly don't want to get cancer."
Bill: "I'm going to get a smoke. Want to join me Dave?"
Jill: "Well, I guess smoking can't be that bad. After all, Bill smokes."
Bill: "Well, just last month you supported the bill. So I guess you're wrong now."
Bill: "But you are wearing a leather jacket and you have a roast beef sandwich in your hand! How can you say that using animals for food and clothing is wrong!"