Well, what is the point of having a gun if you have no idea how to shoot it, never practiced, and have no idea how to care for it? Just possessing a gun is not some magic. In fact, one of the things drilled into me in a course about the legality of firearm usage in my state was that even if you have a gun, people with knives can fucking kill you faster than you can pull out your weapon and aim. You can't think of it as some magic solution. You have to be otherwise physically able to deal with that situation.
He, like many, thinks he can be as fat and unhealthy as he wants, but as long as I have muh gun, it is all ok. No, it fucking isn't.