In fact, when it comes to Iraq, Bush was at his worst when he was humbly deferring to the generals and at his best when he was arrogantly overruling them. During that period in 2006 and 2007, Bush stiffed the brass and sided with a band of dissidents: military officers like David Petraeus and Raymond Odierno, senators like John McCain and Lindsey Graham, and outside strategists like Fred Kagan of the American Enterprise Institute and Jack Keane, a retired general.

Bush is also a secretive man who listens too much to Dick Cheney. Well, the uncomfortable fact is that Cheney played an essential role in promoting the surge. Many of the people who are dubbed bad guys actually got this one right.

The additional fact is that Bush, who made such bad calls early in the war, made a courageous and astute decision in 2006. More than a year on, the surge has produced large, if tenuous, gains. Violence is down sharply. Daily life has improved. Iraqi security forces have been given time to become a more effective fighting force. The Iraqi government is showing signs of strength and even glimmers of impartiality. Iraq has moved from being a failed state to, as Vali Nasr of the Council on Foreign Relations has put it, merely a fragile one.

The whole episode is a reminder that history is a complicated thing. The traits that lead to disaster in certain circumstances are the very ones that come in handy in others. The people who seem so smart at some moments seem incredibly foolish in others.

The cocksure war supporters learned this humbling lesson during the dark days of 2006. And now the cocksure surge opponents, drunk on their own vindication, will get to enjoy their season of humility. They have already gone through the stages of intellectual denial. First, they simply disbelieved that the surge and the Petraeus strategy was doing any good. Then they accused people who noticed progress in Iraq of duplicity and derangement. Then they acknowledged military, but not political, progress. Lately they have skipped over to the argument that Iraq is progressing so well that the U.S. forces can quickly come home.

But before long, the more honest among the surge opponents will concede that Bush, that supposed dolt, actually got one right. Some brave souls might even concede that if the U.S. had withdrawn in the depths of the chaos, the world would be in worse shape today.

Life is complicated. The reason we have democracy is that no one side is right all the time. The only people who are dangerous are those who can’t admit, even to themselves, that obvious fact.