The US has the highest gun ownership in the world and the highest murder rate in the developed world.
Gun Suicides in US, 2011: 19,766
Percentage of all Murders that were committed by firearms in US: 69.3
The United States continues to be peculiar in handing out powerful magazine-fed firearms to almost anyone who wants one and not requiring background checks on private purchases even if these are made at gun shows. 80% of civilian-owned firearms world-wide are in the US, and only Yemen vaguely competes with us for rates of firearm ownership; And even it has fewer guns per person than the USA.
It has gotten to the point where the increasing epidemic of mass shootings now threatens the US military, the most powerful military in the world.
The US is downright weird compared to civilized Western Europe or Australia (which enacted gun control after a mass shooting in 1996 and there have been no further such incidents).