We simply cannot afford, as a nation, to put enough troops in Iraq to control what is basically a criminal problem in Iraq, unless the locals themselves are willing to step up and address it. I've watched any number of Police Departments around the U.S. use that strategy--with the same results--over the last 20 years.
I knew it was doomed to longterm failure. The root problems of violence in Iraq weren't addressed, only the symptoms were.
It's like dosing a guy who has liver cancer with tylenol.