The most obvious objection involves Moore’s Law: even if robots can’t do something today, there’s a damn good chance they can do it tomorrow. Another problem—one that can bite you in the ass right now, while you’re waiting for tomorrow to happen—is that even people can’t reliably distinguish between friend and foe all the time. North American cops, at least, routinely get a pass when they gun down some innocent civilian under the mistaken impression that their victim was going for a gun instead of a cell phone.
