Can We Leave?

I've never been convinced of the case for leaving Iraq as it is. I was against the war as it was my opinion that a unilateral U.S invasion would compound the problem and affirm the crusader image that Al-Quaeda likes to proliferate, but is leaving now the correct option? Don't we hold great responsibilities as the invading countries to ensure that Iraq doesn't descend into more death, and more mayhem?

Some question whether it could be worse, but I believe it could be a great deal worse if security were to suddenly decline to allow these people to hold sway:

'Gunmen in a second car, seeing Hassan on his phone, pulled forward and fired two fatal shots into Hassan's head and neck.
The murderous turmoil in Baghdad has reached a point where many families never know the killers of their loved ones, or their motives. Sunni insurgents? Shiite militias? Killers that mimic one or the other, while pursuing private motives of greed, spite, or revenge? Or, in Hassan's case, the nature of his employment, which placed him doubly at risk: as an Iraqi journalist, and as an Iraqi working for Americans?'

These stories are by now common in Iraq, it's a horrible situation, but if we leave what's in store? What's the prediction for it's future from those who want forces to quit Iraq?

I realise that many in the U.S.A are sick of the lives lost on their side and would rather their people home and safe, but this desire doesn't include a thought for what's best for Iraqi's trapped in a dilemma of our design. Is it moral to be the catalyst of this kaos and then leave it all to them?