It usually boils down to who controls the technology, not the absolute cost.

Centralized AI killbots with no safety controls are almost certainly bad.

Individually owned and controlled militias of defensive (and decentralized) AI killbots? Unclear.

You don't lower the cost of killing by improved targeting, you lower it by thugs shooting people in broad daylight with no consequences.

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.

No, I'm not kidding. Some people need to be killed. Look at all the "collateral damage" when America kills people that need to be killed. Could AI help let us kill the people who need a killing, without killing the people who shouldn't be killed?