Mentally unstable people should not be allowed to handle or own weapons. I'm all in favor or psychological evaluations for people wanting to own a gun, and periodic reevaluations after gun ownership is obtained. They're a big responsibility.
I also don't think kids (under 18) should be able to even handle one without responsible adult supervision. Such as hunting or target shooting with responsible, trained adult.
EDITED: 22 Oct 2014 06:15 by CYBATRON