In pre-state societies, we generally seem to see around a 15% chance of dying due to warfare in your lifetime. Early states seem to see that fall to around mid-high single digits. And this decreases to tiny fractions in modern times, but mostly because warfare has declined rather than wars becoming less deadly. Brutal episodes of war--say the Eastern Front on WW2 or some of the theaters in modern wars--can see overall death rates of up to 20 or 30% of people involved. Given that the amount of people involved in military action has generally decreased (pre-state societies generally mobilize their entire military age male population as warriors, modern industrial states... don't), this suggests that ancient warfare is approximately as brutal as even lopsided modern warfare.
*really neither the sins nor the wins in WWII belong exclusively to the Russians. Another subtlety misleading aspect of this post.
I didn't mention any wins. As for the sins: did you get that despite my listing something the British did and something the Americans did?
As one of the first leaders of the Cheka said, "We are not waging war against individual persons. We are exterminating the bourgeoisie as a class".
Fighting the modern US would be also be some sort of bizarre existential dread, knowing that every move you make is probably tracked and you have a decent chance of being killed with absolutely no warning.
Legends of the Galactic Heroes did a great job exploring that theme.
Wars end when the enemy loses heart, not sons.
There is a myth that the 5.56 round was designed to wound and not to kill (contrary to the 7.62 round the soviet side used) as it would make war costly in a very visible manner.
I guess the idea that inducing "Sepsis by poop" follows the same line of thinking.
If you're an grizzled noncom equivalent, when the newbies suddenly wind up with a fresh pile of squishy goop, you tell them the same story, and have them run their weapons through it, making them feel better about having squatted down in front of their buddies?
Lagniappe: how about this as a way to take physiological signs of adrenaline and turn them into an "I meant to do that" moment? https://www.youtube.com/watch?v=u_rotEpFtZU&t=64s