Originally posted by ArtificialGlory
Yeah, and that's the thing. Calling for genocide of 1billion+ people is one thing, but a professor having the ability to ban you from a class for expressing opinions that may not entirely fall on the left side of politics is quite another. No professor should be able to turn a class of a publicly-funded uni/college into some kinda of an ultra-liberal twilight zone. Same goes for ultra-right, of course, but ‒ let's face it ‒ that's far less of a concern in contemporary academia.
What is and is not an "acceptable viewpoint" is ultimately arbitrary, and comes down to who is making that decision.
Either a professor can ban any viewpoint, or they can ban no viewpoints. It is impossible to enforce a middle ground.
edit: With that said, a student could appeal to the school board to make the professor stop being a **** and censoring them, but the point stands: it then comes down to multiple people, rather than just one, deciding what is and is not acceptable to be discussed.