George Walker Bush is not a stupid or a bad man. But in his conduct as president, he behaved stupidly and badly. He was constrained by neither the standards of conduct common to the average professional nor the Constitution. This was not ignorance but a willful rejection on Bush’s part, in the service of streamlining White House decision-making, eliminating complexity, and shutting out dissenting voices. This insular mind-set was and is dangerous. Rigorous thinking and hard-won expertise are both very good things, and our government for the past eight years has routinely debased and mocked these virtues.
President Bush was unmoved by any arguments that challenged his assumptions. Debate was silenced, expertise was punished, and diversity of opinion was anathema, so much so that his political opponents–other earnest Americans who want the best for their country–were, to him and his men, the moral equivalent of the enemy. It is important to note just how different such conduct has been from the conduct of other presidents from both parties.
From a Ron Suskind piece in Esquire. He explains.