You don't think the radical left is a problem that the far right is feeding off of? Then the cycle goes on. They both feed off each other.
And I frankly don't care much for your example. My grandfather was a Pole who had to fight Nazi invaders, and I have no reservations about him having to put a few bullets over them.
Nazis and fascists do not want a free and fair society. They delight in the violence of it and have no interest in a marketplace of ideas.
Don't take my word for it. Listen to community activist Victoria Beach explain how she is upset for them terrorizing the area and hijacking the Black Lives Matter movement.