I suggest people who believe censorship can stop hate speech take a little tour on China's social medias.

We had very strong censorship systems built by the government, but does it stopped hate speeches? No.

In fact, if you make people can only post & receives filtered info, then you are actually pushing them to an echo chamber. And an echo chamber is a very nice place for people to fermenting hate speeches (I'm not saying it will, but it could).

So in my opinion, hate speech is bad, but censorship is worse.

The problem must be solved in a different way, without introduce censorship.