[ardy42]

> So basically in both cases, people are just hiding what they truly know/think in their minds instead of speaking them out.

Every culture is going to have taboos and forbidden things. The important questions are who enforces them and why.

> On the other hand, people in US enjoy freedom to exchange ideas on whatever they want, except politically incorrect topics in public.

People in the US enjoy the freedom to exchange almost all ideas in public, including politically incorrect topics. For some extreme examples, look at the "Dark Enlightenment" folks and racists like Richard Spencer. However, many people choose to not use that freedom because they wouldn't enjoy the experience of other people using their freedoms to personally reject them or to tell them that their ideas are stupid, wrong, bad, etc.

That situation is only superficially comparable to Chinese censorship, and that comparison ignores the very important and fundamental differences.