You’ve got some worthwhile points but you push the case too far. For example “niggers deserve to die” is obviously hateful. It requires no interpretation. “Police Lives Matter”, however, requires knowledge of current events and a particular interpretation of those events to be considered hateful. The disturbing part here is not that these two phrases were not treated the same, but that those posting the first phrase were not banned when other posters making much less controversial comments were.
In any case, find out about Tor and the Dark Web if you don’t know about it. That makes censorship much more difficult, and it should become the default for all internet users.