I really don't see it that way. And neither do most of the gunnies I personally spend time with. Anyone who has been in bad situations knows that it doesn't make you Superman. It doesn't even make you Green Arrow. But it does change the odds and alters most conflict situations. Most of the time it makes you avoid them. When a gun is present anything can become a deadly force situation instantly. Most of us would prefer not to have anything to do with that unless we absolutely have to. So you learn to let things slide.
As for coming to someone else's aid, I've done it. With a gun present but concealed and without one. It's something I would have done anyway, but it was much better to do so with that option available. It wasn't heroism or a feeling of invulnerability. It was just what I do augmented by having the right tool for the job.
I will say something that will get almost all the gunnies and knifers here mad at me. And in this case it might be a good thing.
There's a stage of development where you do feel invulnerable, covered with hair, ten feet tall and with huge swinging testicles. And that's just the girls

With the boys it can be much worse. Fortunately, almost everyone grows out of it pretty quickly. It's kind of like Green Belt's Disease but with a higher geek factor due to the hardware. It's a combination of novelty, insecurity, fear, unintegrated psychic factors, power and a number of other things. It's sort of like getting a driver's license for the first time. And like the driver's license almost everyone gets past the "Vroom! Vroom!" stage pretty quickly. It just becomes part of life, another set of capacities and responsibilities.
Some don't. And you can spot them. They're the ones who are
constantly playing scenarios in their head. Usually involving Sarah Brady, Senator Schumer, a reinforced platoon of swarthy terrorists, a dozen large Negroes with razors and half the European Kindred Aryan prison gang. The fantasy usually has the special effects budget of a minor Hollywood action flick with them as the heroes. It's almost always coupled with inarticulate fears about "Them" rushing out and "coming for our Guns". It's all motivated by fear with the corresponding desire for control and power. That's not unhealthy in itself. But when someone is stuck there it's a sign of lack of balance in other areas of his or her emotional life. It's like staying in Condition Orange or Red all the time.
The weird sexual stuff that the hoplophobes talk about is almost never a gun thing. Shooting someone isn't even a violent act. There's a noise, a slight thump, and someone falls down sometimes a quarter mile away. That just isn't going to carbonate most people's hormones. Unless it's the "They tried to kill me, but I survived!" rush which is a well-known turn on, shooting is just too, mmm, delicate an act for that visceral rush. Bang! Thud. meh.
Now knives are another thing altogether. Sticking a knife into someone, watching the tissues part, feeling the body give way, blood, smells and all the rest of that is a very intimate act. If someone is cross-wired in unwholesome but unfortunately not uncommon ways it can plug into the libido. I see that one way more often than I'd like to in people who are heavily into knives, not as tools or collectible objects but just out of knife-craziness. If you've been in the RBSD or FMA community for any length of time you'll know what I'm talking about. And you're a damned liar if you say you haven't seen it :shrug:
Again, most people who get into those areas go through a mild form of the disease. In some reasonable time it evens out and gets integrated into their personalities. The objectionable parts go away. And it's all good.