That's a much better argument than I thought you were making, so my apologies for misunderstanding.

I still disagree though - I think Reddit probably agreed with you for most of its existence, but evidence indicated that rationality and clear arguments weren't winning, and the virality of these ideas was too potent to be overcome by a few people who were willing to wade into the cesspool. So they drained the cesspool.

I agree with you that, if we could be sure that there would always be enough people to argue against racists, and do so calmly and rationally, then we would be better off not censoring racism, and instead letting the debate play out. But I don't think we live in that world.