i don't own a gun because umm...there's almost no practical use for them in this century. 90-something percent of us don't need to hunt in order to obtain food, so other than some crap sport of shooting at paper targets or clay discs, there's no need for an ordinary citizen to own one.
not that i think they should be done away with completely either.
in some US states, citizens are allowed to carry a concealed weapon, providing they pass thorough background checks and proficiency training, and also pay a fee (i think it's anually here)
If every individual who wished to own a gun had to meet these same stringent requirements, we'd probably be a lot better off.