Also, I got to agree with bonker, just because you don't want violence to exist or even won't use any violence yourself (ever), that does not mean nobody else won't either. If you believe that, that to me seems like a very naïve worldview to be honest.
i agree with you. but the fact that someone use violence, it's not a justification at all, for who accept this bad thing like a normal and civil thing.
I like tit-for-tat as a moral standard myself, in part because "[it] is [] a highly effective strategy in game theory for the iterated prisoner's dilemma":
http://en.wikipedia.org/wiki/Tit_for_tatI would not hit anybody on the head, but if somebody hits me on the head, I will hit that guy on the head as well. I will not do it harder, I will not do it twice, but I will hit the dude on the head.