You're confused. You're thinking about the real world. That no longer matters.
Decisions are made by a professional screeching minority (our betters) subsidized by our paychecks who make decisions based on platitudes and feels. These decisions are then forced on everyone, because, we still go to work on Monday and follow their rules.
Once it was decided that men and women are perfectly equal (new morality). Any argument, fact, or evidence demonstrating otherwise becomes immoral. The only moral thing to do is ensure equal outcome. And thus, young girls getting killed on the battlefield is a moral imperative.
If women don't like this, it is up to them to fight it. Men aren't allowed to hold a contrary opinion (see above).

