So basically then if a murder is done by a democratically elected government it's less of a murder then committed by some organization or individual. Sounds to me like a convinient explanation of those who see government sanctioned assassination as something acceptable. But then again, most of the so called enlightened free world thinks so, or they just willingly turn a blind eye, same thing.
And Bin Laden wasn't self-appointed as an leader of a radical Islamic organization, he was financed, trained, equipped by the US who actually created him as such when he was seen useful. When his tactics and rules of war was seen as guerrilla warfare of a freedom fighter when he fought the Soviets. But if a group uses the very same strategy and means against coalition forces in Afghanistan and Iraq today they are in the eyes of the west nothing but terrorist. Terrorist or freedom fighter, assassin or soldier, good or evil, in the end it all depends on the point of view of the observer.
Don't try and use an argument based on reason with Americans. They believe in god don't you know.