Are you saying that if they considered PewDiePie to be inciting hatred of a particular racial or religious group which could potentially cause violence against that group they shouldn't complain?
Shutting down his YouTube channel wouldn't be censorship, no, he still can express his opinions.
A public library banning books or limiting access to them is censorship, and sometimes a good thing too, but its actions can be challanged in the court and it would have to justify them.
A religious group can't ban a movie, they can campaign for the state to do so or seek to convince others not to show or view it. thats their right, but they can't compel others not to view or show it so they aren't censoring it.
I don't believe this is censorship. I also don't believe in an absolute right to freedom of speech but thats a different issue.