As a candidate for president, George W. Bush famously promised to pursue a “humble” foreign policy. The events of 9/11—for Bush akin to a conversion experience—swept humility by the board. The 43rd president found his true calling: Providence was summoning him to purge the world of evil.

When it came to fulfilling this mission, Bush’s subsequent efforts yielded precious little. Recklessness compounded by profound incompetence became the hallmark of his administration. Yet of this there can be no doubt: Until the day he left office, Bush himself remained certain that his intentions were pure and the nation’s cause righteous. In particular, he believed, and believed deeply, in the Iraq war.

Bush’s Freedom Agenda ended in abject failure—no liberalizing tide has swept the Islamic world. The promised Iraqi weapons of mass destruction and the evidence linking Saddam Hussein to Al Qaeda never materialized. Implementing the heinous Bush Doctrine of preventive war in Iraq yielded an insurgency that sent millions fleeing to squalid refugee camps. As a direct result, thousands of American soldiers were killed and many thousands more maimed or otherwise deeply scarred.

Despite all of this and more, George W. Bush never wavered. He remained resolute, his conscience clear. He knew he was doing God’s work. He was—and no doubt remains today—a true believer. The 43d president was a well-intentioned fool, who inflicted grievous harm on his country. Yet when Bush stands before his Maker (or the bar of History), he will say without fear of contradiction: “I did what I thought was right.”

Barack Obama is anything but a fool. Yet when called upon to account for his presidency, honesty will prevent him from making a comparable claim. “The problems I inherited were difficult ones,” he will say. “None of the choices were good ones. Things were complicated.”