A key point:
First, let’s talk about understanding “the borders.” They are fictitious. The “borders” that describe the “country” of Afghanistan have trivial effect on the enemy, but the borders (without quotes) greatly affect Pakistan and the Coalition. The AfPak frontier will be sealed the day frogs stop croaking. We complain that Pakistan should help, but they can’t do much. We haven’t secured the Tex-Mex border. Many Afghans are migratory in the way that we see Mexican laborers in the United States. Only instead of just picking corn, some will pick corn and supplement their income by planting a bomb. For some, it’s just business, like being a hired gun in Iraq or Afghanistan. Lots of normal people will do those jobs.
Go read the whole thing.