@JTT,
JTT, it's not denying them their rights of free speech, it's more like izzythepush mentioned, their perverted ideas they present ad nauseam.
I wouldn't call promoting rape and child pornography as unpopular messages per se, it's coming from sick minds who have found a platform here to promote their agendas. I have to admit that my stomach can't handle them any longer and cowardly put them on ignore.