While watching the video in the http://smith-wessonforum.com/concea...barbershop-friday-night-video-link-added.html thread I realized no one had mentioned something important in this thread.
The possibility that the bad guy will have a negligent discharge if you don't intervene. I would not expect violent criminals to demonstrate safe gun handling skills. Whether war-gaming scenarios in your head or actually being in the situation you may decide to shoot the bad guy to prevent harm by an ND instead of an intentional act.
So, you're advocating shooting the bad guy because you think he might be too stupid to shoot the people he intends to shoot?