"the commission was charged with explaining not only what happened, but also why it happened. In looking into the background of the hijackers, the staff found that religious orthodoxy was not a common denominator since some of the members "reportedly even consumed alcohol and abused drugs." Others engaged in casual sex. Instead, hatred of American foreign policy in the Middle East seemed to be the key factor. Speaking to the F.B.I. agents who investigated the attacks, Hamilton asked: "You’ve looked [at] and examined the lives of these people as closely as anybody. . . . What have you found out about why these men did what they did? What motivated them to do it?"