The truth about THIS particular instance is we don't actually know if this victim should have a gun or not. He doesn't have training or trust his training and practice. And he essentially doesn't trust his judgement. Fair enough. I know from experience that when the adrenaline flows it is difficult to keep your wits about you. No gun might be the correct answer for him.
My point is there is not one black and white answer for everyone.
Personally I prefer to have options and possessing a gun is one of them. Do I want to use force against anyone? Heck no. But I will if cornered and that is the way out.
I encourage everyone to get training and experience. Whether they chose to have a gun or not is another topic.