I think most who have the ability to live in your manner, just visit home and Air Base, wouldn't even bother to carry a gun on themselves at any point. Not everyone can avoid bad neighborhoods and bad situations. My father for one is 79 and sometimes does appraisals in areas that aren't necessarily safe. When he gets assigned a fee appraisal from FHA or VA, he can't turn back the ones where he'd rather not go. In those areas, he goes armed, usually openly. Not everyone has the same living or working situation, where some may be safer than others. It's not fair those who live in a relatively safe manner at all times should restrict those who don't from taking precautions to adequately or hopefully secure their own safety.
Personally I have no desire to carry a weapon like a gun around. Most times I wouldn't. It would depend on where I had to be or drive through, and even there a route can be designed to avoid the high crime areas.
Personally I'm glad police in this country are armed. I would feel safer if I knew there were a lot more out there willing to carry and hopefully for protecting not just themself, but others if the occassion should arise. To me it's inconceiveable that ex-military, retired military or police, and others trained in firearms suddenly shouldn't be carrying a personal firearm around just because they are no longer in that area of work. Did they suddenly become untrustworthy by leaving the police or military? No.