Are you a troll? The "kid" in question is not a kid, and responsible for his own actions, including taking his parent's gun, if that even is the case. 

Second of all, guns are not the problem. You could murder someone with a paper clip if you were apt to. People misuse and abuse everything that has a good purpose...drugs, food, money, sleep, sex, and many other things. If your neighbor used a crane to drop a box of bowling balls (both good things) on a group of his buddies whom he'd rounded up for plotted demise, would you now want to ban cranes and bowling balls? 

Yes, guns kill. They kill criminals who intend to kill the innocent, they kill non-sentient animals when we're starving and need sustainance...
And in the WRONG hands, bad people kill good people, as they have always done. Violent criminals should never be allowed to own guns, but are only violent criminals after they've committed their crime. 
It is not the way of the American justice system to punish without a crime.