The risk to America has always been a creeping big Government morphing gradually into a Socialist Dictatorship. The Alt-Right are a pathetic group of Anarchists, Racists and Losers, who are going nowhere. They are a convenient foil for Antifa, though: “Look, there are Nazis in our midst! Fight them!”
This in the view of Leftists justifies their violence: What could be worse than the return of Hitler’s Nazis? They need the Alt-Right, Neo-Nazis and KKK to give them targets to release their violence on, and demons to scare recruits into their ranks.
If they ever take control of Government, you will find out just how awful “equality” can be. Ask the citizens of the former USSR.