Lock the guns somewhere indoors and make them inaccessible to children/adolescents in the house. You don't need a ban, you need common sense. This kid had access to this firearm and for whatever reason felt like using it inappropriately. Stop this from within.
"Please, Mr. rapist, wait until I find my keys and can unlock the gun cabinet."
Nope. Teach your kids right. The guns in our house were never locked up. If we wanted to shoot one, we asked my father. If he said 'not now', that was it. Mess around with them and you will be banned from shooting, hunting, fishing, for a YEAR.
We always asked, were seldom told "No." (dad likes shooting, too). We learned how to shoot and properly handle a gun at an early age, too, and were hunting whitetail deer, squirrel, and ducks before we turned ten years old.
If you can't trust your kid to do that, you have other issues to deal with, and the gun is the least of that.