Common sense says that we should just get the hell out of dodge, this cannot be won, short of turning the mountains to glass.
Our footprint on the ground is fueling the insurgencies simply by giving them something to fight. If we were not there, they would be fighting between themselves for the poppy profits.
This sucks for the Afghan people as a whole, but its way it's been for hundreds of years, and they don't seem to mind the status quo, so why should we.
There has never been peace in the region and there will never be peace in the region, pessimistic yes, but it is what it is.