**WITHOUT ANY HUMANS INVOLVED.**
That’s the problem.... humans that WILL be involved for inhumane purposes.
As long as humans are still involved in the conception, design, construction, programming, and testing of robots, and the only thing the robots do is execute the programmed instructions, then frankly I'm more worried about "inhumane purposes" that can be accomplished with the human-involved animated objects we've had for over 75 years, such as armored vehicles, tanks, and rocket launchers. They're plenty terrifying, if you're at the receiving end of a beat-down.
Just sayin', if that's your worry, we're already there.