Censorship "theory" is sound. And that's what is so pernicious and dangerous about the idea. The idea of removing content that could cause harm makes total sense. If the people making the censorship decisions were widely respected experts in the field and ideologically neutral, and used extensive and rigorous processes to determine what should be and what shouldn't be censored based on actual harm not political leanings, and were also accountable, then it could in theory be a useful tool.

But censorship practice is utterly corrupt. It's based on ideological goal-driven thinking, a form of thinking most of us use most of the time (unfortunately). The decisions are made by non-experts who are nameless, faceless and unaccountable. The result is dangerous and divisive.