Margaret Sullivan: To fight hate speech, don't muzzle it

“One of the problems with defending free speech,” the celebrated author Salman Rushdie said, “is you often have to defend people that you find to be outrageous and unpleasant and disgusting.”Those descriptions, and worse, certainly apply to the white supremacists, neo-Nazis, racists and bigots whose message has caused such turmoil over the past week in two cities, Charlottesville and Boston.Their message may be vile. But in America, they get to say it. And letting them do