I think there is moral absolutism and YouTube (and others) should definitely moderate everything. There is a ranking of "Good Ideas" and "Bad Ideas." Examples of a Bad Ideas are Neo-Nazism and Anti-Vaxxers. Examples of a Good Ideas are gardening and science projects. There are thousands of these sorts of ideas, and they can be ranked by intelligent and cultured people. Yes, they are going to offend and upset people, but people are already upset! The Silicon Valley culture tries to offend as few people as possible, but this is not realistic. If they really want to help people, they should do everything they can to share good ideas while they eschew the bad ones.