"There is clear evidence that tightening laws — even in highly individualistic countries with long traditions of gun ownership — can reduce gun violence. In Australia, after a 1996 ban on all automatic and semiautomatic weapons — a real ban, not like the one we enacted in 1994 with 600-plus exceptions — gun-related homicides dropped 59 percent over the next decade. The rate of suicide by firearm plummeted 65 percent."
http://www.washingtonpost.com/opinions/fareed-zakaria-the-solution-to-gun-violence-is-clear/2012/12/19/110a6f82-4a15-11e2-b6f0-e851e741d196_story.html?hpid=z6