Here's a quiz that may appear some day on history tests: Maj. Nidal Malik Hasan, who killed 13 people at Fort Hood in November 2009, was: a) Part of a terror network that had planned attacks on the United States since the 1990s; b) A deranged psychotic who snapped under the pressure of treating soldiers returning from Iraq and who happened to be a Muslim; c) A prime example of "The True Believer," the lonely, frustrated individual who attaches himself to an overarching cause as a way of compensating for personal disappointments. The answer, of course, is "c," the true...