With apologies to Jane Goodall’s furry colleagues, chimps are just not good people. A friend of mine lost the better part of his hand to a really nasty one and Dr. Goodall herself watched an all-male patrol systematically exacting genocide on the males of a neighboring troop. There is a profound difference between us, but genetically, we’re 98 percent alike. If we just nudged the evolutionary clock back the tiniest bit — on every airline passenger, Starbucks customer, coworker and passerby — our societies would dissolve in a horrifying bloodbath. But they don’t. We just board the plane and assume...