And our side won't last long when we're the only ones using a rule book.
At the beginning of the Battle of Britain, a single German bomber mistakenly dropped its bombs on a residential area. Churchill immediately ordered the bombing of Berlin. The mass bombing of German cities eventually lead to their defeat. War is an aberration when the normal values of a society are suspended. We can not successfully defend ourselves from a ruthless enemy, who will do ANYTHING to win, by tying our hands behind our backs. As the old addage says, "Good people sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf".