Regardless of the number, handing them a clear and obvious victory can and will enable them to create new and more direct plans.Our own military says that very few of the insurgents are foreign fighters. 2 to 3% at most.
Your asking american soldiers to die in a civil war. In which there is no prospect of military victory. That's just plain wrong. Only political solutions by iraq and its neighbors will end it.
Whether or not you want it to, this will effect our safety directly. Whether or not you or I wanted it to happen, it has. And whether or not I want it to be that way, it is. In fourth Generation warfare of this type perception can make or break you, we must be smart on the way we extricate ourselves. As Kissinger said, a fast retreat would be monumentally stupid.
Now can you link us to 2 to 3%? Or is that number off the top of your head?