Why should hate speech be protected? Why should those who preach hate be allowed to have a platform?
You have the right to control what you hear. But no one has the right to control what others hear or choose to hear.
Those who preach hate must be allowed an equal platform as anyone else because the definition of "hate" changes depending on who is using it and the people "in charge" - in gov't - who'd inevitably be responsible for defining hate - change by the second.
You cannot trust that "only good people who have similar definitions of 'hate' as me would be elected!" because, well, based on your post, I think it's safe to assume that isn't the case for you in life right now. (Or me neither, not picking fights here.)