Within your system, to kill is obviously a moral crime, but to kill another in punishment only compounds the original error. Someone very well known who established a church -- if you will, a civilization -- once said, "Turn the other cheek if you are attacked." The original meaning of that remark, however, should be understood. You should turn the other cheek because you realize that basically the attacker only attacks himself. Then you are free, and the reaction is a good one. If you turn the other cheek without this understanding, however, and feel resentful, or if you turn the other cheek out of a feeling of pseudomoral superiority, then the reaction is far from adequate.