I understand that, but it's not as simple as saying "let's fuck up all the guys with swastika tattoos", because ideologies are often internal and so after the guys who are brazenly neo-nazis have been dealt with, where do you go from there?
I'd think very carefully before advocating for civil violence between citizens of one country, it's a hard bottle to stop again when once it's been opened. I'm saying this as a non-American looking in, and so I appreciate it's not quite as emotional and immediately relevant to me, but I've seen plenty of hate preachers in my country. It always makes me seethe, but I'd exhaust every other possible avenue before I considered violence.