An execution would just turn him in to a martyr... lock him up for, what's he have left to live...? 10 yrs tops? (I'm thinking their life spans are a bit shorter but I'm not sure how much).
Put a TV camera in his cell so people can tune in 24/7/365 and see him in that cage.
Hey a New BoogieMan!! I got the rights to the movies, books, comics, documentaries, and internet viewing!!!
(I'll let the Iraqis retain the TV viewing and movie rights)
Go to bed NOW Amhed or we'll let the boogieman out to getcha!