lol

I believe a social media site could operate with every single user's real name and address posted in their profile.

Yeah, lots of sites do. It tends to lead to people self-censoring a lot more than they do on reddit. It's also why reddit is reddit and not facebook.

The fact is, people have hurt others long before doxxing

I can't even

the number of instances when doxxing has resulted in violence are so few that this argument is irrelevant to me

I can only assume then that you have not understood the argument.

in the face of how many people have been harmed by censors

Who exactly has been harmed by censors? See the thing is, there is censorship and then there is censorship. Name one person who has been significantly harmed by a private internet site choosing to exercise their right not to allow people to say nasty things about other people.

Censors have beat down more doors and disappeared more people than any doxxer.

I can only assume here that you are talking about people being censored by being killed or imprisoned by authoritarian regimes for writing things that said regimes did not agree with. That's not exactly comparable now is it?

By the way, every government I know of exercise some censorship. If nothing else they tend to censor people who want to share sensitive, classified material. There are very necessary and legitimate uses of censorship.

Perhaps this is not one of them but honestly I don't see why it wouldn't be.