According to a study in the Harvard Journal of Law & Public Policy, which cites the Centers for Disease Control, the U.S. National Academy of Sciences and the United Nations International Study on Firearms Regulation, the more guns a nation has, the less criminal activity.
http://www.beliefnet.com/news/articles/harvard-university-study-reveals-astonishing-link.aspx?p=3
Toms Blog on Life and Livingness