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You're confusing speech and actions. Contract killing is bad not because of speech (after all, the contracting can be done in complete silence), but because of someone actually doing the killing.

Another problem, a much bigger one, is most of what people claim to be "hate speech" these days simply isn't. Post certain factual stats on race or Islam on HN, and you will get banned for hate speech. It's hurt feelings, and they often clash with reality.