Wikipedia:Two wrongs don't make a right

The proverb "two wrongs don't make a right" highlights the illogic of claiming innocence because of someone else's bad behavior. Such excuses are a form of whataboutism and a discrediting tactic. Left unchallenged they can lead to a morass of alternative facts in which the basic principles of right and wrong are obscured – this is often the intended result.

We would all like to believe that it's an obvious lesson we learned during childhood, and that we are unlikely to be fooled by it as adults. Nonetheless, Wikipedia editors will sometimes resort to it as a tactic to evade accountability in dispute resolution, by deflecting attention away from their own conduct to the conduct of their accusers. Whenever such a tactic is used, it's important to recognize it for what it is, and nip it in the bud.