From the Times:
“What we figured out is that people in the Pech really aren’t anti-U.S. or anti-anything; they just want to be left alone,” said one American military official familiar with the decision. “Our presence is what’s destabilizing this area.”
Maybe the official finally got around to reading Kilcullen's Accidental Guerrilla? It's about as neat a summary as you could find of what's wrong with the whole idea of "winning" the war in Afghanistan.