one small addition to the remarks by pdx rick.
"ne reality they discount: When L Paul Bremmer fired all of the Iraqi police and military three months after our invasion, those tactically trained men became iSIS under al-Zarqawi.
I would add: When we were invading Iraq we told the police, and military that if they would stay out of it they would keep their jobs. We then dropped thousands of leaflets to that effect so everybody knew (I used to have one but can't find it ). They stayed out of it, and THEN we fired them (they were a bit upset and, obviously, didn't know that our word is often worth nothing ).