> In the end, white supremacists and other kinds of supremacists existed before the internet. By supporting China-style censorship you're not actually eliminating those ideas, or even stopping their spread.

They existed before the internet, but the internet has given them a tool to organize that they didn't have before. And by censoring them online effectively, you take this tool away from them.

Which is exactly what happens in China. I am sure Chinese officials know ideas and philosophies spread on the mainland, but as long as the people who believe in those ideas and philosophies can't organize effectively then they can be controlled.