Look, I'll try to level with you here. Let's say that everyone you think is a Nazi, is actually a Nazi. And let's say that everything is justified in the pursuit of the greater good. I'm not sure I agree with these things, but for the sake of argument, I'll take them as given.
What are you hoping to achieve via violence? I mean let's say you fight and win. What do you gain from this? Are Nazis gonna be all like "well **** me, I didn't think there would be violence in this whole Nazi thing! I guess I'll give up now!". Has violence been a great deterrent in the past (I'd like to direct you to my previous post). Look, that guy who has a swastika tattooed into his forehead is never going to agree with you. And he doesn't have to. You're competing for the middle ground, the centrists. I mean think about that clown who drove his car into that crowd of protesters. He did more harm to his movement than Antifa could ever dream of.