[quote]if you know a man has the potential and desire to kill, why wouldnt you kill him?[/quote] To be honest, having the potential and desire to kill someone does not necessarily mean they will. For example, I have the potential, and desire to kill a few people, but I never will. I will not follow through, unless my life is in mortal danger. Only when my life, or the lives of others are in immediate mortal danger, do I think it's reasonable to use equal force.