On Wednesday , Canada’s Supreme Court ruled that the government has the power to censor anyone who publicly says anything “likely to expose a person to hatred or contempt.” Except that hate is a natural human emotion. It can no more be banned than love can be banned. Bill Whatcott, a self-styled Christian evangelist, was the target of such a prosecution. Twelve years ago, he was charged with hate speech because of his hobby: Handing out hand-scrawled flyers criticizing gay sex, and calling homosexuals “sodomites.” Whatcott is an odd bird; when he was young, he says, he engaged in gay...