Obviously, if people felt safe, they wouldn't feel the need for all these guns in the first place! But the more guns there are, and the more idiots get hold of them, the less save we all feel, and the less safe we all are. It's a problem that feeds itself. More guns are not making us feel any safer, nor are they making us actually any safer. Yet the idiots among us just keep buying more and more of them, imagining that more guns will somehow make them safe. It's become the insanity of an addiction.
It's not a problem which just appeared overnight. There's a long history, coupled with the history of firearms itself. Our frontier heritage created a mythos of the lone settler in the wilderness needing weapons to fight off whatever dangers he or his family may face. There may be wild animals, bandits, or outlaws to face - without any sheriff or police close enough to handle it.
Since the outlaws had guns, the good people also needed guns to defend themselves - or at least, that became the common perception.
In more modern times, people have become influenced by stories of urban decay, street crime, organized crime, corrupt/incompetent law enforcement agencies, along with general notions that "it's just not safe out there." Movies like
Death Wish put in people's heads the notion that the police are pretty much useless and that the only way someone can survive is if they deal with the criminals on their own terms.
Some people have stockpiled entire arsenals because they think there's going to be some major upheaval or zombie apocalypse or something like that.
I don't think it's a matter of the guns themselves, but more a matter of what people think and feel, what they fear, and what have been the major influences in life which shaped their worldview.
What overrides all of this is that firearms exist all over the place. Someone invented gunpowder, and over time, the technology to build and improve these kinds of weapons developed into what we have today. The genie has already left the bottle. Even in places where people are starving and living in destitution, somehow they manage to acquire weapons to fight in civil wars and insurrections - because the world has many willing suppliers.
In other words, the same mindset exists at the highest levels of power, where we're preparing for the worst and believing that there is danger all around.