Comment by Evan Ackerman

We’re not going to be able to prevent autonomous armed robots from existing. The real question that we should be asking is this: Could autonomous armed robots perform better than armed humans in combat, resulting in fewer casualties on both sides? The problem with this argument is that no letter, UN declaration, or even a formal ban ratified by multiple nations is going to prevent people from being able to build autonomous, weaponized robots. The barriers keeping people from developing this kind of system are just too low. Consider the “armed quadcopters.” Today you can buy a smartphone-controlled quadrotor for US $300 at Toys R Us. Just imagine what you’ll be able to buy tomorrow. This technology exists. It’s improving all the time. There’s simply too much commercial value in creating quadcopters (and other robots) that have longer endurance, more autonomy, bigger payloads, and everything else that you’d also want in a military system.