"Obama's dark vision of the overthrow of the Afghanistan government by al-Qaida-linked Taliban or the "killing" of Pakistan by small tribal groups differs little from the equally apocalyptic and implausible warnings issued by John McCain and Dick Cheney about an "al-Qaida" victory in Iraq. Ominously, the president's views are contradicted by those of his own secretary of defense. Pashtun tribes in northwestern Pakistan and southern Afghanistan have a long history of dissidence, feuding and rebellion, which is now being branded Talibanism and configured as a dire menace to the Western way of life. Obama has added yet another domino theory to the history of Washington's justifications for massive military interventions in Asia. When a policymaker gets the rationale for action wrong, he is at particular risk of falling into mission creep and stubborn commitment to a doomed and unnecessary enterprise."
Update: Added link to wikipedia's entry on the domino theory.