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Whatever the strengths of his impassioned performance, Vice President Joe Biden underscored the tragic emptiness of America's involvement in Afghanistan when he emphasized that the United States would be leaving by 2014 no matter what. It seemed to say that the U.S. goal there was to get out regardless of the consequences. No matter that the government America leaves behind is weak and corrupt, and the Afghan forces we have trained are unlikely to vouchsafe any true security to that country: We are going, despite more than 2,000 lives lost and hundreds of billions of dollars spent -- and with little to show for the effort beyond the heads of Osama bin Laden and a few of his henchmen. The Taliban know this and are just biding their time. Although their resurgence will be a bad...