Anyone who commits a mass attack has mental problems. Timothy McVeigh, the Oklahoma City bomber, probably did have post-traumatic stress disorder, and Boston Marathon bomber Dzhokhar Tsarnaev probably was manipulated by his mastermind brother. The 9/11 hijackers also (apparently!) had disordered thoughts. Nobody ever says that he needed housing services. Like these other attackers, James knows right from wrong and action and consequence. In one video, he said that “I wanted to kill people” but “I don’t want to go to f–king prison.” Should the FBI have zeroed in on the videos James posted just before his attack, when he...