Here is another resource for you on this topic.

https://amzn.to/4dbobV2

It's a book about the exact say thing, but looking at terrorism.

Your focus here is ww2 but you'll be able to find a lot of resources on how people shooting at each other shoot to miss. People hate killing each other.

Thanks for sharing this.

" The greatest trauma soldiers faced in the war was being conditioned to kill. "

Here you seem to imply the conditioning is the cause of PTSD. Is there evidence for people who go through the conditioning, but don't get deployed still suffering from PTSD?

I'd think the conditioning actually helps lower PTSD but... I wouldn't be surprised if it were the opposite. Seems hard to test?