Why is this kind of comment allowed on HN? I see no difference between this and a comment a person paid by some government/organisation hostile to China would write.

This person is spewing nationalistic hate without any sources and arguments. Almost nothing in the comment is falsifiable.

Can dang elaborate on this issue? Are comments of this kind usually removed or not? I'm thinking of writing a browser extension which would remove those from new and problematic users. I come to HN to avoid this stuff.