In the immediate aftermath of Michael Brown's shooting, before we learned that he had not been shot in the back, that he had not had his hands up, that he had, in fact, attempted to grab Officer Wilson's gun, I wrote in favor of requiring more police to wear body cameras. Assuming nothing about Wilson's guilt or innocence, I wrote, "Cameras cannot repeal aggression, bias, rage or stupidity -- but they can certainly diminish them. And with cameras, justice for the guilty -- cop or civilian -- is more attainable." In the wake of the grand jury's decision not to...