There are more firearms in the USA today than ever and yet the gun crime rate has been going down.

 http://www.forbes.com/sites/larrybell/2013/05/14/disarming-realities-as-gun-sales-soar-gun-crimes-plummet/#7c97705d7de9

The March Pew study, drawn from numbers obtained from the Bureau of Justice Statistics and Centers for Disease Control and Prevention, also found a dramatic drop in gun crime over the past two decades. Their accounting shows a 49 percent decline in the homicide rate, and a 75 percent decline of non-fatal violent crime victimization. More than 8 in 10 gun homicide victims in 2010 were men and boys. Fifty-five percent of the homicide victims were black, far beyond their 13 percent share of the population.