Reply #12: It's legal to defend the life of a perfect stranger, too.

[TheWraith]

However, he probably would not be immune to possible civil lawsuits from the family of the assailant.

In any event, you're making a lot of assumptions there about the nature of people who carry concealed. For instance, it might interest you to know that in a large and growing number of places half of concealed carry users are women, and that the vast majority of defensive uses of a firearm end without a shot being fired, let alone the assailant dying.