"But that runs both ways. Not only do I think that almost all (to borrow a mathematical term) speech should be permitted, but also that the onus is on the speaker to make themselves heard or to find an audience. No company or platform owes them anything."

Thank you - that is very succinctly put and is a reasonable and actionable standard that I hope more people will subscribe to.

That being said, I can't imagine how difficult and frustrating it will be for facebook (and others) to police any kind of definition for "white nationalism" which seems very vague and open to all manner of misinterpretation.