Violence won't get you anywhere as it will harden their beliefs and force them more into their "tribe" (because humans are tribal anyways). I would suggest listening to this: https://www.npr.org/2018/09/24/651052970/how-a-rising-star-of-white-nationalism-broke-free-from-the-movement. Black's new friends invited him over for Shabbat dinner week after week. Gradually, he began to rethink his views. After much soul-searching, a 22-year-old Black wrote an article, published by the Southern Poverty Law Center in 2013, renouncing white nationalism. Also, if someone is looking for a fight like these guys the best way to counter it is to be kind because they don't expect it at all.It was only after he began attending New College of Florida that Black began to question his own point of view. Previously, he had been home-schooled, but suddenly he was was exposed to people who didn't share his views, including a few Jewish students who became friends.
I loved that NPR piece. And there are a number of those kinds of stories that cover the "being exposed to alternate views/cultures broadens mind of wicked little fucker" angle. I just don't think these people deserve my time. They aren't worth the effort, honestly.