It also makes it easier to shift the Overton window in favour of statements like "Hitler did nothing wrong" by recruiting more "idiots" to the Holocaust-denying

It also makes it easier to shift the Overton window in favour of statements like "Hitler did nothing wrong" by recruiting more "idiots" to the Holocaust-denying cause. Or more accurately, recruiting ignorant and impressionable people who probably shouldn't always be expected to know better — but who might have otherwise. This is also a kind of harm, albeit a more indirect one. And before you reply "that's what schools are for"; what difference does it make whether a body of beliefs is government-sanctioned and taught in schools or "merely" treated as a respectable opinion in the public square? A naive kid may have their opinion swayed just as strongly, if not more, by a street cultist preacher than by an overworked, burned-out schoolteacher. Would you be okay with Scientology being taught in schools? I assume not. Would you be okay with Scientologists luring children into a camp five metres away from a school? Fifty metres? Five hundred? At what point does it stop being harmful enough to be worth prohibiting? I don't think there is any. I would rather live in Germany than in the United States, and one of the main reasons is precisely this kind of free speech absolutism.