I don’t have to drive too far from my home to find real racists. Within an hour’s drive, I can find true white-sheet-wearing KKK members, and I can find Black Panthers. Their mutual, seething hatred of each other based on skin color would, in a simple physics equation, cancel each other out. But in matters of race, these groups simply feed one another’s fire, and build each other up, in an unwinnable, atrocious war. Being white, and brought up in New Hampshire, I never saw race relations in any forum other than one-on-one. There were three black kids in my...