Of course, this burden is not ours alone to bear. This is not just America's war. Since 9/11, al Qaeda's safe havens have been the source of attacks against London and Amman and Bali. The people and governments of both Afghanistan and Pakistan are endangered. And the stakes are even higher within a nuclear-armed Pakistan, because we know that al Qaeda and other extremists seek nuclear weapons, and we have every reason to believe that they would use them.