Roman Emperor Domitian is remembered for only one joke. “It’s a terrible thing to be an emperor,” Domitian said, “because everything thinks your paranoia about being assassinated is groundless—until you’re actually murdered!” Soon after Domitian was assassinated. Extreme vigilance is the essential mood of tyranny, which must inhabit that condition not just first because it is indeed in danger of overthrow and surrounded by enemies but also because it requires its people to be fearful and isolated, therefore conditioned for extreme solutions.