Censorship is certainly necessary on some level. Child sexual abuse material, for example. Animal brutality material, rape/snuff material, and so on. I do NOT want this stuff shown to me, ever, and I don't want anyone else in society to have access to this material ever. Even just a short exposure to these things can be life traumatizing to people, as it has been to me.

Racism/sexism is a lot murkier of a topic. There's a lot of nuance there that I think we culturally haven't fully figured out. The whole "cracker" situation on twitch, for example.