Tolerance of intolerance breeds intolerance. Gotta nip Nazism and Fascism in the bud as soon as it becomes apparent, lest we end up electing a Nazi Fascist… like what just happened.
Yep, one of the best ways I've seen it put and will now repeat back very poorly is that you need to treat tolerance as a social contract. Rather than get pulled into an argument about being intolerant to the intolerant making you a hypocrite, it's more about tolerating those who also subscribe to the same social contract of tolerance.