I actually am not super worried about "robot killing machines." The trigger is "pulled" when the commander decides to deploy them. A pilot fires a missile or drops a "smart" bomb and it's guided onto it's target. I hardly see this as being any different.

Much like a shell that gets fired, after the gun goes off there's no way to make the bullet come back. Same with a rifle for that matter? Autonomous hunter-killer robots that look for things that appear to be the enemy are almost certainly better than what we have now...

If you're fighting a war, a machine that "kills everything that looks like a human with more than 65% accuracy" in a region that is run off of a series of Haar Cascades would probably be better than shelling the region into oblivion.

I don't know, I get the hate and reticence to give decision making over to the robot, but... maybe the real answer is we should stop having wars?