I think it boils down to how many young soldiers are going to die?
There is no win-win situation, the last time I read about the complexity of being there was, that the American soldiers were getting shot from all sides (Sunnis, Shias )
Then the multifaceted terrorists groups were happy to rush to the conflicts where Americans and western countries were involved just to get a good shoot at the soldiers.
Add up that the cost of being there maybe was around a trillion, <----(inputs are welcome), our debt is in trillions too ( input is welcome). The economy strength of the dollar or our economy is/was ( you pick) touchy. The European countries along with America are not so excited about going in there any more (popularity loss?), I think Canada is pulling out (right?).
But then it also comes to what would you rather have spend all that money in the Middle East or fix the deficits in our economy? as Social security for example? Many states have huge deficits. I was wondering, all those men that rush out of Syria should have being trained and armed, send to fight for their country a Syrian draft, (instead of westerners ) and give the asylum to women, elders and children.
Tough decisions for any president or government of the Western Hemisphere.