Here's a study from Harvard.
http://www.law.harvard.edu/students/orgs/jlpp/Vol30_No2_KatesMauseronline.pdf
"If you are surprised by [our] finding[s], so [are we]. [We] did
not begin this research with any intent to “exonerate” hand‐
guns, but there it is—a negative finding, to be sure, but a nega‐
tive finding is nevertheless a positive contribution. It directs us
where not to aim public health resources.
150"







