We don't call war hell because it is fought without restraint. It is more nearly right to say that, when certain restraints are passed, the hellishness of war drives us to break with every remaining restraint in order to win. Here is the ultimate tyranny: those who resist aggression are forced to imitate, and perhaps even to exceed, the brutality of the aggressor.

Just and Unjust Wars: A Moral Argument with Historical Illustrations (ed. Basic Books, 2015) - ISBN: 9780465052707