We need to interrogate and then kill them (snark). When it comes to US citizens I still believe that even as the President makes the claim "they just needed killing", there needs to be some kind of warrant or other lawful order that authorizes the killing. Make it known that Mr X is on the list and has been declared an enemy combatant. Who knows maybe the threat will be enough to stop some of the terrorism. Secretly taking people out just seems completely wrong.