Theodore Dalrymple has this op-ed in the WSJ with the above title. His thesis is that psychology, especially as popularized in Alfred Hitchcock's Psycho, enables perpetrators and others to rationalize that the person who committed the crime was not the "real" person. He analogizes this to belief in demonic possession.

"Psycho," then, is a medieval tale in modern costume. The Enlightenment never reached the Bates Motel.