Invasion of Afghanistan had a direct link to 9/11. Terrorists were being given safe haven there by the Taliban government, and this included Osama and the Al Qaeda leadership. 9/11 for America is a parallel to Pearl Harbor. I have no issue in getting some payback, closing down a safe haven, getting a new popularly supported government in office, beating back Taliban and Al Qaeda attacks from across the Pakistan border. We also need to be there and negotiating with Pakistan about eliminating their safe haven for Osama and Al Qaeda. And this may entail our cross the boarder strikes either by artillery shelling, air strikes, drones or infantry as negotiated with the new Pakistan government.