After listening to six weeks of argument, tears and revelations, more of the jurors who spared Zacarias Moussaoui’s life were moved by the confessed al-Qaida conspirator’s turbulent, deprived childhood than by claims that he was a delusional psychotic seeking martyrdom.

In rejecting execution, some of the nine men and three women, drawn from the suburbs of the nation’s capitol near the Pentagon, also seemed to be swayed by the limits of his role in the deadliest terrorist attack in the nation’s history.