This is a point that the late Jungian psychologist James Hillman raised (and I encountered for the first time) in his book a decade ago titled "A Terrible Love of War." http://www.amazon.com/Terrible-Love-War-James-Hillman/dp/014...

It's different than the normal HN fare, but worth a read. We may be a society of killer apes, but we're not as eager to kill in warfare as you might think. Especially when the other guy was compelled at gunpoint by his government to join the military (that is, drafted) just like you were.