When it comes to Afghanistan, history is not on McChrystal's side. The only foreign invader to have any success here was Genghis Khan – and he wasn't hampered by things like human rights, economic development and press scrutiny. The COIN doctrine, bizarrely, draws inspiration from some of the biggest Western military embarrassments in recent memory: France's nasty war in Algeria (lost in 1962) and the American misadventure in Vietnam (lost in 1975). McChrystal, like other advocates of COIN, readily acknowledges that counterinsurgency campaigns are inherently messy, expensive and easy to lose. "Even Afghans are confused by Afghanistan," he says. But even if he somehow manages to succeed, after years of bloody fighting with Afghan kids who pose no threat to the U.S. homeland, the war will do little to shut down Al Qaeda, which has shifted its operations to Pakistan. Dispatching 150,000 troops to build new schools, roads, mosques and water-treatment facilities around Kandahar is like trying to stop the drug war in Mexico by occupying Arkansas and building Baptist churches in Little Rock. "It's all very cynical, politically," says Marc Sageman, a former CIA case officer who has extensive experience in the region. "Afghanistan is not in our vital interest – there's nothing for us there."
This article illustrated better than anything else I can think of, that we need to leave today. It is over.