When Pakistan was being bombarded by U.S. drones, 20 other nations could have done the same, including China, Taiwan, Israel, Mexico, North Korea and India. And Pakistan could have retaliated with its own drones.
By 2050, drones may be, more often than not, autonomous. A human will be able to overrule the computer, but in most cases, the machine will likely be capable of making lethal decisions on its own.
And by replacing pilots with semi-autonomous drones, wars become easier to wage ... and easier to start.