None of this is a free speech issue. Facebook get's to choose whether you can openly speak there specifically because it is outside the realm of free speech and inside the realm of a private business.

Free speech at least in the US is protected by the constitution so if this was a free speech issue it wouldn't be on the table because the answer would be: you can't restrict it.

They want the speech which is best for their business. What else are they, a corporation, supposed to want?