KYLE SMITH: The Hard Untruths of Ta-Nehisi Coates: A bestselling polemic riven with hatred thrills the liberal elite.

Suppose you were a white person with a deep-seated dislike for black people, and you were intent on training your son to feel the same way. Suppose that, day after day, week after week, you instructed him to study the details of every instance of black-on-white crime. Say you advised your son to extrapolate from these incidents the notion that black people are generally dangerous, and that your zeal to present him with disturbing anecdotes along these lines never waned.

You would be wrong, in just about every possible way: statistically, sociologically, morally. You would be doing your son a gross and damaging disservice. For yourself you would invite, and earn, broad contempt. If your opinions became publicly known, you might well find yourself unwelcome in polite company and your job at risk. Indeed, the National Review contributor John Derbyshire was fired for expressing such sentiments in a blog post three years ago.

And yet for harboring roughly the same level of suspicion, fear, mistrust, distaste, and unease about whites as Derbyshire does about blacks, the essayist and blogger Ta-Nehisi Coates has found himself crowned America’s leading civic thinker.

Well, you can usually predict what “decency” will permit or forbid by asking whether it helps or hurts Democratic turnout.