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Almost every forum tries to mould the discussion and topics, if you want an example of ones that don't check out 4chan or some subreddits.

It's not about anyone taking offence; we don't limit racist or homophobic posts because some take offence, we do it because those things are unacceptable. And we certainly wouldn't want to have racist threads and say "oh if you don't like it don't go into that thread".

In your terms we moderate illegal or unacceptable behaviour, and unacceptable has changed over time, it's just continuing to change. Limiting and eventually removing racist or homophobic posts/posters hasn't created a culture of censorship and over moderation IMO (and if we alienate racists or homophobes, more the better), I don't think this will either.