We should be grateful for people like Horowitz and Mansfield. Their arguments don't always convince us, but they should remind us of how vigilant and valiant we all must be in defending the right of people everywhere to be controversial. We should try harder to remember the immortal words of Voltaire, who said, "I may not agree with a word you say, but I shall defend to the death your right to say it." Only when these words characterize our moments of greatest disagreement will freedom of speech truly be secure.
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