As a rape victim, I'm curious whether you'll allow the actual negative of what occurs when you don't punish the soldiers who abuse the women? How many revenge killings will there be from those you're trying to protect? How much organized resistance? Do you want to motivate your enemies? You can increase their power, if you offer their loved ones horrors. What happens to the morale of those soldiers who have a conscience, watching all this? What about those without? How often does the abuse of power remain contained...?
What happens to the children watching it? Will you allow them to become rapists too?
How long will your society last, if the world decides someone else, anyone else, should be their savior? You'd better be a skilled player...
Meanwhile, a player who demands only the best from their soldiers, may inspire defections and surrenders from those who dream of being the best, that bring them talented people they might not have otherwise met. Even if individual soldiers fail, legends have a life of their own.
Sometimes I truly wish I could mass-murder people through internet. And I wouldn't regret it, nope, not even a little, good sir.