I think if someone is a white supremacist that's ok as long as he doesn't trespass other people's rights and starts harming them, I don't think the supremacist thing is limited to white's, other races have people who think like that. The problem is when these people go a step further and start hating, and worst of all is if they take action based on this hate.
In the case of this guy you can say he was insane which you can deduce from his facebook page, but I think he is just a guy full of hate and wanting to blame everyone else for his own idiocy.