Most who have taken martial arts classes for any length of time have learned to walk away from fights, not from fear but from a true sense of humility. I've gotten to know at least one of the worlds great practitioners (a name some of you may know) and others, and the common trait is a real, deep-down humble spirit derived from years of training and practice.
Not so with a gun. Any yahoo with a few bucks can get a gun and go looking for a fight. In most states, all you need is a minimal class and money for the application and PRESTO you can carry concealed. It takes a great deal of courage and strength to walk away from a situation that could have gotten ugly fast, and ended badly for one or both parties. As much as knowing when to get involved and actually taking appropriate action.
Don't get me wrong, I'm not advocating years of training to get a CHL, just encouraging new license holders to not be afraid to walk away from a situation. It may contrast with the 'macho' image you see in the movies, but it can be the true mark of strength in an individual.