Mark Steyn:

And to have convicted, sentenced and executed the dictator is a signal accomplishment for the new Iraq. When I was in Ramadi, west of Baghdad, shortly after the war, a young boy showed me his schoolbook. It was like my textbooks at his age - full of doodles and squiggles and amusing additions to the illustrations. With one exception: the many pages bearing pictures of Saddam were in pristine condition. Even a bored schoolboy doesn't get so careless that he forgets where not to draw the line. When the cowardly thug emerged from his hole, it was a rare moment: in the fetid stability of the Middle East, how often do you get to see a big-time dictator looking like some boxcar hobo and meekly submitting to a lice inspection by an American soldier?...

The reality is that, as long as he was alive, there was always the possibility that he would return. When a dictator has exercised the total control over his subjects that Saddam did, his hold on them can only end with his death.