We do not know whether the killer of Reverend Pinckney and eight others knew all of this history. But he surely sensed the meaning of his violent act. It was an act that drew on a long history of bombs and arson and shots fired at churches, not random, but as a means of control, a way to terrorize and oppress. An act that he imagined would incite fear and recrimination; violence and suspicion. An act that he presumed would deepen divisions that trace back to our nation's original sin.