Robots are scary only because they allow for ubiquitous drone warfare—millions of drones just clogging the streets, or maybe small enough to hide in the shadows like stray pets. For targeted drone warfare, though, we've already had the technology for a long, long time.
http://www.theguardian.com/world/2015/feb/10/drones-dream-ye...
At least with the robot there's the potential for the excuse that it's gone wrong rather than wanting to kill people for whatever reason.
Oh, the robot did it. Great, like that is going to make it all okay. Fuck, drones have already allowed those in charge to excuse themselves from bad choices, now who are we going to blame? The programmer or the robot? I guess whomever ever has the least protection under the law, the robot certainly won't care
This has been happening since thousands of years before drones came along. Humans are used since the beginning of time..