It's often been said, "Violence never solved anything." The simple truth is that when you are slammed up against the wall and the knife is at your throat, when a circle of teenagers is kicking you as you curl into a ball on the sidewalk, or when the man walks into your office building or school with a pair of guns and starts shooting, only violence, or the reasonable threat of violence, is going to save your life. In the extreme moment, only force can stop force.

It's often been said,