<p>People who are convinced that they themselves aren’t ignorant usually are, just as people who are convinced that they’re more tolerant than everyone else are usually the most bigoted. If you want to see real intolerance, go to a school that calls itself liberal, where people with opposing views are so often shouted down, and where diversity is celebrated only if it’s the right kind. Everyone has a bias; some of us just think we don’t.</p>