Mary Anne Franks, a law professor and expert in self defense, comments about gun ownership:
What I said in my testimony and what every credible study on the subject has concluded is that in general, the potential benefit to anyone – man or woman, trained or untrained – of using a gun in self-defense is far outweighed by the established risks of increased injury and death correlated with increased gun access.
She has links to studies, and explains the problem in more detail.
Meanwhile, campus carry advocates are trying to persuade everyone that more guns on campus will reduce sexual assault. The statistics there don’t really work either.