Are you serious? When you lower the cost of killing, nobody wins.
Centralized AI killbots with no safety controls are almost certainly bad.
Individually owned and controlled militias of defensive (and decentralized) AI killbots? Unclear.
I understand the argument that moving the decision making power to a black box would clear conscience of the operator, yadda yadda yadda, but newsflash, price of human life is falling so quick, that I think we're far beyond the point where it matters.