Aren't they? Shouldn't there always be at least one side in the war that isn't just trying to protect their own life? Killing someone in self-defense (if your

Aren't they? Shouldn't there always be at least one side in the war that isn't just trying to protect their own life? Killing someone in self-defense (if your own life is in danger and there is no other way out) is quite universally accepted I would think. Of course this will get quite interesting very fast if an invading army just walks around not trying to shoot anyone.