"John Brennan, the present CIA chief and at one time the president’s chief counter-terrorism advisor, once advised us, “Nor do we describe our enemy as ‘jihadists’ or ‘Islamists’ because jihad is a holy struggle, a legitimate tenet of Islam, meaning to purify oneself or one’s community.” If Major Hasan or the Tsarnaevs do not believe in jihad or in an Islamist worldview, what, then, drove them to murder? Losing a boxing match, or perhaps a slow-moving pathway to lieutenant-colonel?"