Is Pakistan's Islamist threat largely invented? Yes, says a recent Carnegie Endowment policy brief. It argues that to secure its rule, Pakistan's military establishment invents the Islamist threat. But that's really no surprise. An invented Islamist threat ensures that a dictator is given American support. The absence of a threat, meantime, turns the dictatorship into a potential American target in the war on terror. The real surprise is in the logical conclusion that the Carnegie paper fails to reach: That Bush Doctrine-style regime change -- or, at a minimum, the real threat of regime change -- is the only way to remove a dictator.