His economic plan would require all the wealth produced by the top 100 U.S. companies. He also previously and openly called for nationalization of U.S. companies. Oh and if you look at his past votes they're almost all opposite of his campaign.
Bernie isn't a moderate (by U.S. standards anyways) he's far left.
I'll give it to you Hillery and Trump are also awful, but they are all pretty distasteful.