Considering, your first point. Facebook no matter what could use their platform sway elections. That's just part of the problem with centralization. At least with user selected filters there is some decentralization with decisions again.

Really, your second point only applies to calls of violence. Even in the US the exceptions tend linger around violence. Then after that people worry about what is called "inflammatory speech". Mainly since it may lead to violence. However, policies to counter inflammatory speech that are punitive or censorious have problems. First it gives inflammatory speakers a potential real grievance. Secondly, and more concerning is it may limit nonviolent avenues for them to state their believed grievances or views.