First, we (read: our gov't) really shouldn't be doing that in other parts of the world. Second, in this particular part of the world (the U.S.), there are things called laws. The government is supposed to follow them. Those laws do not allow the execution of citizens absent a proper accusation, trial, and conviction. Drone strikes amount to executions (that's the point), thus to do so against U.S. citizens who have not been duly convicted and sentenced is illegal. Yet, that little fact hasn't stopped our nation's top lawyer from saying that if the government wants to do that, it will.