Well, large bore handguns are better than nothing. And by nothing I mean a rifle or shotgun that you don't have in your hands or is leaning up against a tree out of reach or slung on your back. Ever tried fishing with a rifle or shotgun in a position where you can access it if needed at a moments notice? Ever tried to carry one while working a survey crew with a backpack loaded with instruments and supplies while your hands are full of bars and diggers?

Sometimes the only thing that does make sense is not the most effective, but the most accessible.