They usually show up to confront and then violence happens because both sides are heated up.
Also, why do you people keep trying to get a pass by using the different views excuse?
That's the wrong way round. You're the one trying to excuse violence by going "This view is extreme!"
Doesn't matter what the view is, responding to ideas with violence is a no-no
Telling someone I want to kill you or I want you to die or I wish our government kills you or gets rid of you is not a different view, its a THREAT and an invitation to harm. It doesnt become a harmless different view when that you changes from John smith to an entire ethnic group or groups
By this token of logic it's okay to beat up Palestinians because the popular belief there is to want the eradication of Jews.
Sure if someone runs up to you and screams "I WANT TO KILL YOU!" you can make a serious case for the guy being yelled at to act in self-defense if he throws a punch.
But that doesn't happen.
If it's a guy standing in a group going "I support closed borders." and suddenly masked men throw Molitov Cocktails at him and charge him with a tire iron that's wrong, and you going "Well I think he is a Nazi therefore it's okay to attack him based on his views" is sick and harmful. As is your dishonesty about that.
You can't respond to differing views with violence, your parents should have taught you this when you were 3 years old.
Oh I get it. The politics of hate.
Don't go and tell a person you hate them. Organize a 3000 person rally to petition the government to take care of that person's entire ethnic group instead.