That is because in wars leaders want to convince their constituents that “we are good and they are evil” because that is the most effective way to rally people’s support, in some cases to the point that they are willing to kill or die for the cause. Though true, it is not easy to inspire people if a practical leader explains that “there are no laws in war” other than the ethical laws people impose on themselves and “we have to play by the same rules they play by or we will stupidly fight by self-imposing that we do it with one hand behind our backs.”
