Wickedness has darkened this season of lights in Brooklyn. It is no surprise or accident that a ghoul like Ismaaiyl Brinsley bathed himself in messages of hate, racial division and anger and then chose to destroy lives. But Brinsley wasn’t alone in his racially soaked hatred of the police. For starters, a mob has Brinsley’s back. This seemingly disconnected mob has been on the prowl in the months since America learned of Ferguson, Missouri. They’ve smashed up windows of banks in Berkeley, burned up bakeries in Ferguson, and looted, burned, shot, robbed and killed across the nation. But such mobs...