Where in aforementioned international humanitarian law, step (c), is it preordained that one child's collateral death is negligible? See, therein lies the crux of the issue. The definition itself is wise enough that you can't just lawyerese your way through the issue.

In your scientistic rationalization using weaselwords like "expected to be exclusive", "the [subjective] standard for permissible..", "a death is [objectively] negligible", and so on, it is rather the case that your explanation is so laden with prejudiced pseudoreasoning that you are blind to it and unwittingly helping to spread ideological misinformation.