I've seen too many examples throughout history of people trying to use nonviolence and do things the right way and just getting slaughtered because the other side simply does not care to be a pacifist. The world is clearly a better place because people employed violence in WWII to stop the Nazis. And street fighting in the 30's was one of the ways that the Nazis secured their power in the first place.

Nonviolent methods are tools that are useful to have in your toolbox, and in many situations, they are more practical in achieving your ends. But there are cases were violence is more practical, even necessary, and one shouldn't shy away from it when it's needed. You gotta have your head in the game, the stakes are too high. A diversity of tactics is best.

The logic that violence is oppressive so it should be renounced in all cases in order to reduce oppression is idealist. You have to look at the actual evidence and material situation to evaluate what effects violence will have in a given situation.

Punching Nazis is cool and good. Just try not to get arrested for it because it'll take you out of the action longer than it will them.