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.
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Hamas: Agreement reached for return to calm on Gaza border with help of Egypt, Qatar, UN (Haaretz)
from the article: Patriotism sans borders