Dude, they’re gonna exist anyway. Banning them does not change them. It just … mutes them from you. They’re going to go to their next lemmy/reddit/twitter/neighborhood/bar/whatever and say the same things.
Radicalizing them and getting away from them, or if you’re a very great diplomatic person and persuasive and charismatic to change their minds, is the best you can do. But banning them, just makes them make their own echo-circle ANYWAYS. You’re not changing anything. You’re literally making things worse by banning them. You just make your place seem “safer”, but these people are gonna co-exist in a another circle anyways. You’re not banishing them from existence.