It’s John von Neumann’s idea, at least from the biography I read. Before too much praise is heaped upon him, he also strongly argued for a nuclear first strike on Soviet Union before they got their own nuclear weapons because it was best strategy from game theory POV.

I think there is a general distance to a lot of things in today's society. Very few of us have to farm or hunt for our own food, or clean an animal carcass. I don't have a strong view on the moral aspects of eating animals (I'm not a vegetarian or vegan), but I think it'll probably do some good if anyone that eats meat at some point slaughters, cleans and butchers one of the animals they eat.

I agree, a society shielded from blood either grows callous to it as long as the blood is somebody else's or becomes too traumatised to even defend itself even if the aggressor is perfectly fine killing them