Not ethics. Screwed up sense of ethics, sure. One could easily argue that if you tried to go around the blockade, tgen driving through can be your only form of defense. Especially when they moved into your path, and they have been causing bodily harm. Also now ghey are carrying guns. The requirement of feared for one’s life is pretty clearly met. So if an angry antifa mob tries to stop you drive on through. Maybe they will learn to stop doing that too.
We stand together because otherwise, we don't stand at all.