A Legacy of Failure
Conservatives identify as one of Bush's great strengths his absence of self awareness, his lack of concern for how he is perceived by history or the world ("History. We don't know. We'll all be dead."). But isn't just a little bit of concern for history's judgment (one's legacy) a nice check on bad governance?
As Sebastian Mallaby notes in an aside, "Could he not be bothered to cross-examine the officials who were drawing up plans that would determine his standing in history?"