> what he did

Obviously, calling out for violence and building organizations that commit atrocious acts of violence is a bad thing.

However, it is really hard to do without the help of others.

If you start arguing that your country should invade your neighbors and mass murder various types of people, the people listening have a choice in how they react - do they politely remind you that we're generally happier and richer if we're nice to each other and "treat others like we'd like others to treat us", or shout "JAWOHL MEIN FURHER" and go invade neighbors and mass murdering undesirables?

The problem isn't always the guy shouting hate, it's the crowd listening and implementing hate.