Besides we are not limiting our use of "military force" just to those nations, organizations, or persons he determines planned, authorized, committed, or aided the terrorist attacks that occurred on September 11, 2001, or harbored such organizations or persons..." We are actually enlisting and arming them to take down nations not involved in 9/11 (Libya) and we're not limiting our killing to those persons either. It's now "terrorists" as a generality...now including insurgents who fight an occupying power.
Conventional warfare is not effective and results in collective punishment to others.
“The power to declare war, including the power of judging the causes of war, is fully and exclusively vested in the legislature.” ~ James Madison, Father of the Constitution
“We do not believe in aggressive or preventive war. Such war is the weapon of dictators, not of free democratic countries like the United States.”~ Truman, Sept 1, 1950