You clearly have never fought and don’t know that supply lines and order are crucial to war. If combat devolved into some inhumane, amoral tragedy for every interaction, nothing would be accomplished. But war is about forcibly stopping an opponent, not about going crazy and ignoring all sense or rules. Chemical weapons require an insane amount of discipline to make, move, store, use, and dispose of some of the most dangerous ordinance imaginable.

“War is lawless” is what the naive say. Experience knows better.