Canadian Liberal critiques Iraq reasoning

Link A quote from the article (emphasis mine):
"Good judgment in politics, it turns out, depends on being a critical judge of yourself. It was not merely that the president did not take the care to understand Iraq. He also did not take the care to understand himself. The sense of reality that might have saved him from catastrophe would have taken the form of some warning bell sounding inside, alerting him that he did not know what he was doing. But then, it is doubtful that warning bells had ever sounded in him before. He had led a charmed life, and in charmed lives warning bells do not sound."