And I don’t think we should. It would be impossible to draw a line, and a sliding scale towards censorship (and of course nowadays everyone is insulted or shocked by something). And if we started banning certain content, we would be liable for anything that would slip through.
MusicBrainz is simply an archive of released audio from everyone on the planet. Nothing more, nothing less. Editing something on MusicBrainz is not an endorsement. It just acknowledges the fact that something exists. And bad things don’t go away by pretending they don’t exist.