Kudos to Trump for clarifying his position on the alt right. The many sides to blame comment was vague and could be viewed as both sides are to blame.
My thought is this, I have the right to organize and say whatever I want. If I'm saying my race is better and supporting a movement that was for the extermination of "lesser" races then guess what, that's going to lead to violence due to the relatively recent and raw emotions surrounding institutionalized racism and the Holocaust. It's easy for a bunch of us white southerners to say just laugh at them or ignore them but consider a march through New York by the Taliban/ISIS supporters. It would be the same situation.