The kind of rhetoric that you should be able to say anything you want consequence-free flies well in the US. Not so well anywhere else. If you praise the Nazis in most of Europe you get in trouble, especially in Germany. I don’t quite see how it would be different in South Korea.

People should be able to declare some speech as dangerous speech, because it does way more harm for society than good. The usual problem is that sometimes people try to do this with speech that is not dangerous. Dangerous is very subjective and there should be no such thing as the Ministry of Dangerous Speech.; but if 99% of people agree to something, well, it is a bit less likely that the “dangerous speech” is just an autocracy of the masses. If you disagree so profoundly with 99% of the people around you, then maybe there’s some other society more fit for your views.