A policy of containment has always had a component of deterrence. The enemy in this war is a death cult made up of religious bigots. They think they are on a mission from God so any compromise means they are going to hell rather than to the 72 white grapes/virgins. The only way to defeat them is to destroy them and their ideology. Containment is a concept that requires a rational enemy. A Nihilist enemy must be destroyed.

BTW, the torture meme has had no apparent effect on the enemy one way or the other. Its principle effect has been in the west where it has impacted the sensitivities of those who do not want to fight the war vigorously. Clearly the NY Times and other leftist media organs have had much more to say about it than Bin Laden or Zarqawi. Since they have shown they would do worse if the situation were reversed it is hard to argue that they care beyond wanting to have their operatives give up less information.