John Brennan : Up to 50 nations developing , buying drones , including Pakistan , China , China . The prospect is a world in which every nation has drone warfare capability , he writes . Cortright : Will we give machines the power to kill people ? Drones give nations false impression wars can be waged with less risk , costs . Drones precise , but kill civilians : up to 775 Pakistanis . We must rethink military trend , he writes .
John Brennan : Up to 50 nations developing , buying drones , including Pakistan , China , China . The prospect is a world in which every nation has drone warfare capability , he writes . Cortright : Drones give nations false impression wars can be waged with less risk , costs . Drones precise , but kill civilians : up to 775 Pakistanis . We must rethink military trend , he writes .