Your Karma of -9 leads me to worry about the quality of your opinions, however your arguments are quite well put, so I'll do my best to address them.
Firstly, I mean really hateful fascistic stuff not any of the things you mention - I don't agree with nationalism (or even patriotism, countries are a completely made up idea) but would defend your right to talk about it as you see fit on any platform, paleoconservartism is more than fine too or even talk about advocating gun laws or anti abortion stuff. All fine.
The problem is the current climate is not a fact based discussion about issues on their merits, instead the system is being gamed by these platforms and people using these platforms to wield influence (and craft a society) that will allow much great abuses of power going forward.
I think the Standford prison experiment and the smaller version Cohen ran in his film shows you that people are not good, we all can be riled up and lash out because of strong beliefs we might hold. I think having platforms that don't try to help tone down and instead encourage hateful thinking really is dangerous, especially when a lot of these opinions are based on lies.