This, this right here - and it's not just the US where this shows up (although it's definitely the most extreme). At the core, I think, it's all about "free speech": when you have a constitutional right to say whatever you want, without any limitations, you will first get a bunch of contrarians yelling all sorts of offensive stuff around "for the lulz"/"because they can", and eventually that sort of stuff gets normalized, and then societal cohesion (especially when the offensive stuff is directed towards minorities) and eventually society itself gets poisoned.