Of course, it you meet the Shinto religion express train, they might not share your feelings.My bold; in simple terms, parity of treatment.
Yes, on occasion the Krauts (SS in particular) did indeed murder surrendered PWs at Dunkirk, in Normandy, the Ardennes offensive and other when the Allies were occasions going through Europe. No-one is denying that. But, by & large, a young GI or Tommy going through the bocage, if captured, had a better than even chance of being treated humanely and safely being removed from the area to a holding facility then onward to a PW camp.
Compare & contrast with the Eastern Front, where PWs of either side were lucky (dependent upon your perspective) to survive the capture process, which if indeed you did, would lead to the remainder of your rather pathetic existence in captivity being spent as a malnourished, beaten & abused slave labourer with a life expectancy measured in months. More likely though, you'd get a 9mm round to the neck or a rifle butt to the skull.
If you want the best chances for decent treatment for your blokes when they fall captive, then you have to lead the enemy to believe that their blokes will get the same. The fact that some of their blokes will not keep their side of the bargain is irrelevant; nor do all of ours.
Besides which, it's f***ing inhumane to do anything else, especially out of revenge. Last time I looked we'd moved out of caves several centuries ago.
The rules will have to become far more flexible. top some scum IRA on Gibraltar and elsewhere, no tears from this c/s.
However, when we engage the Russians (no if) your rules of war will be very interesting to review. Multiple beliefs and systems do not share 'our' understanding of war and POW treatment.