"I say we take off, nuke the site from orbit. It's the only way to be sure..."
Seriously. WTF are we waiting for? We fire bombed Dresden. We nuked Hiroshima. Why is Sadr City still standing? Reduce the entire Sunni triangle to rubble.
Clausewitz: "Kind-hearted people might of course think there was some ingenious way to disarm or defeat an enemy without too much bloodshed, and might imagine this is the true goal of the art of war. Pleasant as it sounds, it is a fallacy that must be exposed: war is such a dangerous business that the mistakes which come from kindness are the very worst. The maximum use of force is in no way incompatible with the simultaneous use of the intellect."
The Shia are more than happy to do that for free.