Is it morality or is it recognizing that providing the brain of autonomous weapons has a non-zero chance of ending up with him on trial in The Hague?
Meanwhile, Dario knows his product can't be trusted to actually decide who should live and who should die, so what happens the first time his hypothetical AI killing machines make the wrong decision? Who gets the blame for that? Would the American government be willing to throw him under the bus in the face of international outrage? It's certainly a possibility.