We all pay lip service to the idea of diversity – of ideas, of people. But David Brooks writes that most people want to stick to their own. “Maybe somewhere in this country there is a truly diverse neighborhood in which a black Pentecostal minister lives next to a white anti-globalization activist, who lives next to an Asian short-order cook, who lives next to a professional golfer, who lives next to a postmodern-literature professor and a cardiovascular surgeon. But I have never been to or heard of that neighborhood. Instead, what I have seen all around the country is people making strenuous efforts to group themselves with people who are basically like themselves.”