Can we have humanitarian values without sacrificing intellectual honesty? Political correctness says no, but this is why it is the enemy of the free thinker. The free thinker watches the world and says I have an idea, and political correctness replies do not say it out loud. It is an art that pretends to clean up the language, when really it only propagates an abundance of euphemisms.
Political correctness is the secular form of blasphemy. It demands words themselves are taboo, and it is willing to threaten the blasphemer. I am not an absolutist, I believe there are extreme cases in which we must compromise to an extent with free speech, and we have. Free speech means the government itself cannot prosecute you for your words, but we have rules for people shouting fire in a movie theater. This is sensible.
Language isn’t perfect. Context demands more attention than individual words, and I think that attention is due. When the free thinker suggests his idea, political correctness feels threatened because it knows the idea will change part of the world. It fears this change, and tries to suppress the free thinker so that its world will remain the same—broken, but at least with no bad words.