Keep in mind that the majority of Iraqis were either nominal muslims or outright irreligious. Our entrance into, and destruction of, their country is what radicalized them and created such groups as the 1920's Brigade, etc.
There is a potential for left-leaning folks who aren't limp-wristed milquetoasts to rise up if they think it's "going down" and a side must be chosen.
For a little levity: