On the face of it, the similarities of the undoing of the terrible regimes of Saddam Hussein and Moammar Gadhafi are striking. The spectacles of joy in Tripoli today recall the delirious scenes in Baghdad's Firdos Square in 2003—the statues pulled down, the palaces of faux grandeur and kitsch ransacked by people awakening to their own sense of violation and power, the man at the helm who had been full of might and bravado making a run for it, exposed as a paranoid and pretender, living in fear of his day of reckoning.

In neither...