A lot of constitutional blather aside, nobody has really come up with a valid reason for owning a gun other than out of precaution. I would argue that in modern society gun ownership is the opposite of living cautiously, it is bourn out of a belief (real or imagined) that there exists a clear and present danger in everyday life and an individual needs to gird themselves with arms against this ever present danger.
Good for you. Don't buy a firearm.
The rest of us will continue to agree with the founders position and understanding, which mirrors our own. And meanwhile..until we ever need them for anything more serious, they are fun to shoot for sport. In fact..I think I'll go put a few rounds downrange with one of my many AR's today...must stay proficient, you know. ;-)