This is a conflict situation, a war, pure and simple. While this is a new kind of conflict; when the opponent is a non-state actor states have to be able to strike at these groups that intend to attack them even when they are sheltering in other states. Such attacks should also not include the state where those groups are sheltering unless that state is supporting that group as was the case in Afghanistan.  Yes the distinction between civilian and combatant is blurred by this conflict but this is something that happens regardless of whether the United States uses UAVs. It is the terrorists themselves who through their horrific attacks by ‘civilians’ on civilian targets that strip away the distinction. The United States has to be able to respond with whatever method is most likely to prevent more of these terrorist attacks.