Interesting study:
"5. A comparison of 14 countries in 1989 showed that although rates of gun ownership varies between countries, rates of homicide and suicide committed with a gun correlated with the rate of household gun ownership"
Killias M. International correlations between gun ownership and rates of homicide and suicide, Can Med Assoc. J, 148 (10) 1721-1725, 1993. Quoted in Marshall J. Firearm Violence and Ownership - A public health perspective, WA Health, Perth. 1995.
More gun ownership, more killings with guns. Just like more cars, more traffic accidents, I gather.