SENSITIVITY HAS TAKEN OVER OUR society, and nowhere more securely than in our universities. To see what has happened, consider this small fact. Half a century ago, a liberal Harvard psychologist, Gordon W. Allport, published a book, The Nature of Prejudice, that began the social science study of stereotypes. Though of course hostile to stereotypes, he allowed they might have a kernel of truth. For example, he said, fewer Jews are drunks than Irish. A remark like that could not be made at a university today except in private to trusted friends. And if you made it, you would be...