"Oil" is an oft proffered reason, but it doesn't hold water."But if they confine this to their borders, I'd leave'm alone."
Well wait, do they have oil? If they have oil we have to attack, because of the WMDs.
Sure, Iraq had it, but Afghanistan didn't.
It seems to me to be more about a bunch'o regional issues, with oil being just one.
Religion looks even bigger, with Israel being the tail wagging the dog.