The "hate" section is about political censorship. It's full of people Facebook doesn't like, but can't throw under "crime" or "terror" because they aren't actually dangerous. Notice how the only groups in there are pro-white or white nationalist groups? Not to defend these groups, but by deciding to vilify these people while ignoring all other forms of racial and ethnic pride/nationalism/hatred, Facebook is sending a clear message that they favor some groups over others.