Yes, I have studied logic. I will go through my library and look for references to send where tu quoque is used as a defense, along with military necessity and reprisals, although it can be controversial. I don't disagree with your definition of the logical fallacy. You often accuse others of using Tu Quoque arguments when they are in fact not doing so. The next time I come across one of your posts where you do this I will be sure to point it out.
Top Pakistan court allows military trials in terrorism cases (AP)
from the article: Patriotism sans borders