Actually yes. There are parts of the US that behave like the developed world with gun crime rates comparable to commonwealth countries and Western Europe. The parts with high gun crime rates are full of people who for whatever reason can't handle guns. Usually guns are illegal in these parts of the country to try to help them, although it doesn't really work.

EDIT: Yes, there is actually a slight negative correlation between gun ownership and gun violence by state if you run the data (rather than just eyeballing it.) Gun violence highly correlates with a different trait in the population.