We take free speech for granted in America, unlike elsewhere. The furor over that anti-Muslim video is the latest reminder of that. But freedom of speech is never safe, even here. Many colleges now impose "civility codes." Civility is nice, but enforcing a "civility rule" against offensive speech would put an end to lots of useful provocative speech. As a University of North Carolina student put it, "A picture of Mitt Romney would offend 70 percent of residence hall students." Taping my Fox Business Network show at UNC, I also learned that the college, to "protect" women, had dropped the...