If you give our artists, novelists, scientists and commentators only half the human being to work with, you give them nothing. Decency is a Victorian standard. It has nothing at all to do with morality. A terrible human being can be thoroughly decent, never mentioning sexual or excretory matters in public, and a human brimming with altruism, self sacrifice and other wonderful qualities may be thoroughly indecent. Hitler was reportedly quite decent to guests, while Gandhi sometimes spoke of physical functions to interviewers and even to the world.
Indecency laws prevent speech against as well as for the banned ideas.
Canadian customs routinely prevents the import into that country of explicit, anti-pornography feminist work by authors like Andrea Dworkin. A preacher thundering against abomination may use explicit phrases to describe that which is forbidden. Indecency laws deny the existence of this level of human experience, put it off limits to us entirely. The most complete censorship is the one that denies you the ability to form a vocabulary. By aiming Internet indecency laws at ideas, rather than already formed words, Congress has instituted absolute silence.