That only strengthens the argument that violence is sometimes the answer. It doesn't matter that it's not always the right answer, the fact is sometimes it has been, and no society has ever managed to survive without choosing it at some point or another.
Indeed, there is the argument to be made that the capability to choose violence is critical even if you never actually need to choose it. This is the basis of deterrence theory which has arguably been the cornerstone of international peace for decades and the theory of the social contract which has been the source of most people's freedoms and political power. A people who will never stand up for themselves and their friends, no matter what injustice is done upon them, invites that injustice. By simply acknowledging there exists a point beyond which you would retaliate, you discourage others from risking going past that point.
