The Alt-Right isn't the Klan. The Klan was civil war veterans, then people whose parents and grandparents were civil war veterans and who had been taught the lost cause in school, and then people trying to revive it to oppose the civil rights movement. They got big because they were preaching to the choir. The Alt-Right is a few people who are really into European far right movements and a lot who feel daring cosplaying nazis and making racist jokes. They're Boyd Rice and Michael Moynihan except with /pol/ and twitter they can convince themselves they have an actual movement instead of just trolling. They don't have a choir to preach to, they just have idiot hangers-on who will move on when they stop looking cool and start looking pathetic. Hell, they've already managed to alienate the militia nuts. They can be laughed out of existence.