If Errol Morris had simply recounted the facts, even in a way that emphasized the real suffering of the victims, that would have shocked nobody. They are the stuff of every spy movie, a genre that has successfully turned state surveillance and assassinations into seductive excitement. But unlike that genre, Wormwood—a word for a bitter poison, used by Hamlet to describe bitter truths—doesn’t produce dramatic tension by exploiting our desire to be in on the secret. It exposes us to the baser side of that desire: the narcissism, mean-spiritedness, and contempt that are so often the psychological realities of secrecy.