Drone technology has made it possible to use lethal force in many situations where we could not or would not have even considered it in the past. Unlike conventional military operations, drone attacks require no “boots on the ground,” and therefore do not pose a risk to American lives. Unlike bombings, they have pinpoint accuracy; they therefore reduce the collateral costs of killing and may be easier to disavow. Because drones can effectively travel the world while being controlled remotely from home, they permit the “war” to move far beyond the battlefield. And drones have made it possible for the US government to do something that was unthinkable before, and should be unthinkable still—to kill its own citizens in secret. In short, drones radically reduce the disincentives to killing. And that may well make a nation prone to use military force before it is truly a last resort. That certainly seems to be what has happened here.
Kenneth Anderson has a interesting take on the subject.