The way to stop people like him without killing the foundation of our democracy is to explain rationally why his ideas are terrible and why no one should listen to them, not to prevent him from speaking at all. No one is suggesting that you do nothing.
Debating ideas is one thing. Thoughts are thoughts. Inviting architects of mass death to speak at your university is another thing. Thinkers and speakers get to pull the academic debate card. You should be able to say whatever the heck you want. But once you’ve got blood on your hands you’ve gotta be judged your actions, not on your ideas.
That's a weird and ugly dichotomy, between organizing and ordering the mass killing of thousands of innocent children, and "working perfectly in practice". How many children before it stops being an oopsie-daisy?
