Cutting and running?

Why is it that we presuppose that if we discontinue our occupation of Iraq, then it will necessarily lead to instability and civil war? I feel like the picture of Iraqis being painted is one of people who just can't wait to kill each other! Where do we get that from?
However, we should not "cut and run." We are responsible for the mess, and cannot necessarily right the wrong by just leaving. Anti-war protesters need to come up with SOME sort of positive answer. Otherwise the administration is right to tell us that we owe it to the Iraqis not to cut and run! The extremists who would use violence for their own agenda are in the minority, but they still exist. Thus, there needs to be a UN peacekeeping force present. Security is important for the Iraqi people. It cannot be our occupying force though. It needs to be international, and therefore credible.
Okay, I shall now get my wisdom teeth out now. Pray for me.