Excerpted from my "to do the right thing, sometimes you have to do the wrong thing" answer:
Initially, when thinking about this question, my thinking was that violence should never be resorted to, but when I think about WWII and the French, Italian, etc. resistance movements, I become torn. Those brave individuals were integral to overcoming Hitler and the Nazis. Yet I see some of our citizens moving in the direction of violence in order to get their candidate elected to the White House and that is terrifying. In the end, I suppose it's all situational regarding the rightness of committing a wrong to get to a right.