Instead they act like the problem doesn’t exist. Their predictions for the future are confident but faith-based: all will be well because it always has been. When confronted or pressed for details, they retreat into a familiar platitude, which they repeat like a Zen koan: Diversity is our strength. But is diversity our strength? The less we have in common, the stronger we are? Is that true of families? Is it true in neighborhoods or businesses? Of course not. Then why is it true of America? Nobody knows. Nobody’s even allowed to ask the question.

