I realize the question lends itself to discussions of overall human life and the measures thereof. Maybe we should re-focus a bit.
You are a head of state. You are at war. Aggressor/defender, doesn’t matter right now. You are charged with crafting policies, broad-ranging policies, for the conduct of this war. Your advisors evaluate each policy and give you feeback based on the amount of impact these policies are likely to have on the five groups in discussion. Your civilians, your troops, neutrals, their civilians, their troops. If a policy is in front of you and your advisors tell you it is likely to increase the danger to one of these groups(such as moving troops in to block an advance) and decrease the danger to another group(such as the civilians which would be protected by the troop movement), and they give you estimated body counts(with no numbers smaller than a few hundred) of each group based on each policy. It is your job to weight each of these numbers based on how important protecting these groups are relative to each other.
So you’ve got numbers, but how do you assign the weights?
Enjoy,
Steven