Question: Tu Quoque variant?
Sure sounds like a variation on tu quoque. There are lots of variants; e.g., Nazi admirals said unrestricted submarine warfare wasn't immoral b/c the Americans did it too, and everyone knows Americans are moral, and therefore it was OK.
Paul Krugman calls a variation on the quo quoque fallacy "bothsidesism," which makes sense. That's the mistake of saying that we need to attack both sides equally, regardless of whether the other side is guilty.
In any case, we surely hear lots of hypocrisy from politicians, do we not?
Howard Kahane points out that two wrongs don't make a right, which should settle all of those disputes.