Armies have spent a lot of time and effort training their soldiers not to think of the enemy as human beings. It's so much easier to kill them if you think of them as dangerous animals. The trouble is, war isn't about killing. It's about getting the enemy to stop resisting your will. Like training a dog not to bite. Punishing him leaves you with a beaten dog. Killing him is a permanent solution, but you've got no dog. If you can understand why he's biting and remove the conditions that make him bite, sometimes that can solve the problem as well. The dog isn't dead. He isn't even your enemy.