I am aware of the rules regulations and conventions of war but of the multitude of individual war crimes committed, there are only a handful that are actually prosecuted. It is pretty much shoot first and ask questions later.
War begins by fighting the last war with leftover equipment and weapons. Innovations soon appear. The advantages of killing and destruction are not made to make war 'even steven' or proportional.
WMDs or a sewn-shut mouthful of detesticularization are designed to be terrorizing, not proportional. To think otherwise is for those who don't really know the horror of war.