I disagree. If you believe in censoring opinions and ideas, you do not believe in free speech. Period.
"I'm going to kill (some public figure) tomorrow at (some event)" - threat
[0]:https://en.wikipedia.org/wiki/Will_no_one_rid_me_of_this_tur...
So -- bearing in mind that the speaker's henchmen said they interpreted it as a command -- which side of the line does "Will no one rid me of this troublesome priest?" fall on?
Please excuse the shortcoming I have for explaining this, but I have to fall back on "I know it when it see it" when it comes to what counts as violations of the principle of free speech vs content moderation. In the current zeitgeist though, I absolutely see this as censorship rather than content moderation. This is because I absolutely sense partisan motivations for content take-downs and topic-wide bans on such large platforms as YouTube, Twitter, Reddit, etc.
Public libraries are perhaps another source of analogy. My local library system has some of the most vile and objectionable works ever printed on the shelves due to popular demand. Many public libraries in Canada and the USA are quite absolute about that with regards to free expression. For example: https://www.cbc.ca/news/canada/ottawa/porn-library-ottawa-po... "Library patrons allowed to surf porn, Ottawa mom discovers"
It made politics much more boring.
As it should be.