Jacob Weisberg ponders:

The disputed dates and details go to the most interesting larger issues about what went wrong during the Bush years. Did Bush’s own innocence and incompetence drive his missteps? Or was it the people around him, most importantly his vice president, who manipulated him into his major bad choices?

I would say that surrounding yourself with people who advise bad choices of action, and then letting yourself be manipulated into following their advice rather than the different advice being offered by other people is incompetence. What else would incompetence in a modern president look like?