you do realise there are SO MANY factors in the war that you guys cant contemplate them all
1. if the US leaves the middle east, then that gives terrorists a reason to come to the US instead of fighting on their home turf
2. it gives the taliban more to work with and more to do, ie. they can overthrow government
3. it makes the US look bad as forget
4. you cant just decided it by yourself, congress has to come up with this stuff and agree