> it doesn’t work in the US because of the first amendment and the few limitations on it.

This isn't clear to me. For instance, Meta was free to forbid hate speech on their platforms, or not to promote it in their feed algorithms. I don't think first amendment would force them to authorize hate speech. They do it to align with power in place (freely or coerced, not clear), but it's not a legal enforcement.

> So in countries where hate speech is disallowed, people conform to a less hateful viewpoint as a rule, and hateful people are the exception.

There are hateful people in Europe too.