Same reason I think that banning guns won't lead to the US becoming a dictatorship. It's not the guns or the speech laws that matter, if it's going to happen, the political landscape has changed drastically to the point that concern about the laws is pointless. Now I was talking about it in terms of twitter in my head which got muddied when I brought in the Canadain laws, which was a mistake, but even if the US passed hate speech laws, it's not in the political landscape right now to call BLM or environmentalism hate speech or whatever the fear may be, and if it were possible we'd be in bigger trouble than them calling BLM hate speech. Like if it ever got to that point, they could just as easy call them a terrorist group with existing laws.