There is only one form of censorship that I feel is effective: self-censorship. “Never try to teach a pig to sing; it wastes your time and annoys the pig.” Telling people what they can and cannot say just triggers more of the same. More hurtful words, more of the same. Instead of telling people what they can say, why not engaeg them on a philosophical basis. Yes, its more time-consuming, and potentially frustrating, and is bound to fail possibly more often than it succeeds. But for those times it DOES succeed, the return on time is far more significant, and leads to lasting, positive change, I feel.