Please I ask you to read this Blog about how the U.S. Congress, contrary to public opinion have passed laws, 69 among 99 gun carrying laws allowing citizens adults to carry handgun anywhere, anytime, even allowing students onto College Campuses.

https://changetheworldbytellingstories.wordpress.com/2015/10/09/there-is-a-connection-between-the-recent-since-2009-legistlation-permitting-hand-gun-carrying-ownership-and-the-recent-spate-of-mass-shootings/