1. I was watching the news and in a picture I noticed one of the counter protesters using some sort of spray can as a flamethrower. I also saw the counter protesters beating up a spokesman for the protesters before the police saved him. So violence goes all around.
2. Arresting people just because someone like the parent here calls them violent is a really bad idea. As in, it's horrendous. If all someone has to do is call you violent to have you arrested, then boy can it be used to silence people that say things inconvenient to whoever wants to silence them. Saying "arrest their member" about a political group is extreme, ignores any legal precepts of innocent until proven guilty, and can be used by the most authoritarian groups to silence anyone they choose.
That said I do find protesters very unlikable. The counter protesters I have found a little bit more likeable but still unlikable, because they seem somewhat hypocritical and dishonest, given they have been somewhat violent as well, and have said that it doesn't matter that they were violent as well.