I recognize that. I can't imagine what it might feel like to be a member of one of the groups that these Nazis are targeting, but I do share a visceral thrill when I see one of these scumbags get punched or terrorized.
But we really can't normalize political violence and have things turn out okay. It just doesn't work that way.
As for the rest of your comments, I think you may be guilty of being a bit credulous about the membership, goals and aims of groups like this. Of course, I can't prove that people involved in Antifa are the same people that riot, destroy property and clash with police at the WTO meetings, G-20 summits, and other events. But my presumption is that there is a Venn diagram with a significant overlap, based on the tactics and rhetoric.
The fact there is a lot of propaganda about the group, on both sides, doesn't help matters much.