As far as I understand it, Facebook is a private, not public, space, and they can technically delete anything they want on their own platform. The big mistake is for us to pretend that they are a public space and that they owe us some kind of fairness and equal treatment. Why do we expect this? The sole reason for their existence is profit, they owe us nothing. Rather than taking the platform for granted as the new norm of social and political life, I think we would all be better off destroying it and creating a true, public cyberspace in its place.
Facebook does not need to be fixed, it just needs to be destroyed.