Argument: Stabilizing Afghanistan important to Western interests
"Obama's War." Economist. October 15th, 2009: "the West has a security interest in preventing the region from slipping into a maelstrom of conflict. Pakistan, with 170m people and nuclear weapons, is vulnerable to the Taliban’s potent mixture of ethnic-Pushtun nationalism and extremist Islam (see article). Anarchy in Afghanistan, or a Taliban restoration, would leave it prey to permanent cross-border instability."