The means of destruction can’t be any more ugly than what ISIS has broadcast to the world. So long as they keep publicizing American deaths, our will should remain strong and fairly united. We couldn’t let the Northern Alliance finish off the Taliban because their effective leader Massoud was assassinated at the critical time. Like driving anyone into Pakistan is keeping them from coming back, yikes.
The Taliban are coming back to Afghanistan because the Pashtun population there is feeding them. If the Hazaras, the Tajiks and the Uzbeks had been relocated to the border area, they would have liquidated any Pashtuns who came back to reclaim their lands. Think Hutus vs Tutsis.