Pakistan's Support for the Taliban Invalidates U.S. Strategy
One of the central arguments sustaining American strategy in Afghanistan is that a failure to stabilize Afghanistan would have disastrous consequences in Pakistan. Proponents of the Afghan surge argued that while Afghanistan may not be strategically worth such a huge investment in blood and treasure, the prospect of instability spilling into nuclear-armed Pakistan warranted the move.
This argument never made much sense and a recent leaked NATO report confirms it:
The U.S. military said in the document Pakistan's powerful Inter-Services Intelligence (ISI) security agency was assisting the Taliban in directing attacks against foreign forces.
Pakistan is the architect of instability in Afghanistan, not its victim. It's more than a little ridiculous to argue that we have to fight Pakistan-backed insurgent forces for the sake of Pakistan's security.