Frank Rich in the NY Times does a great job reminding us tat the Bush Whitehouse desire to invade Iraq drove so many things:

Five years after the Abu Ghraib revelations, we must acknowledge that our government methodically authorized torture and lied about it. But we also must contemplate the possibility that it did so not just out of a sincere, if criminally misguided, desire to “protect” us but also to promote an unnecessary and catastrophic war. Instead of saving us from “another 9/11,” torture was a tool in the campaign to falsify and exploit 9/11 so that fearful Americans would be bamboozled into a mission that had nothing to do with Al Qaeda. The lying about Iraq remains the original sin from which flows much of the Bush White House’s illegality.