There are a lot of people in this thread yelling that firearms are bad, firearms are only useful for killing. But with very few exceptions, no one has even commented on the points I have brought up.
First, why was a thirteen year old boy playing with a firearm. At thirteen years of age, I knew that firearms were not a toy. They were a tool used for hunting and putting food on the table. It was also acceptable to use them for target practice to improve your skills at putting food on the table. Firearms are a quick and effective method for hunting. You use shot guns for birds, and Rifles for game. Hand guns are for self defense from rattlers and other critters, and for the occasion when you need to mercifully put an animal out of it's misery.
Second, why was there not a trigger lock in place in the firearm when it was not in use. Even before the age of thirteen, I knew that firearms were stored unloaded (being that I am actually older than the invention of trigger locks). Yes, I knew how to load and use the fire arms, but I was also well aware of the fact that if I misused one of the firearms my ass would be blistered.
Third, When there is a firearm in the house, it is the responsibility of all members of the household to know firearm safety. I learned how to use a firearm from an uncle who was home from the Vietnam Conflict, when I was 5 years old. Before I was 5, I knew damn good and well that I was to keep my hands off the firearms.
The answer is not more regulation. The answer is not banning firearms. The answer is not automatic vs semi-automatic vs repeating action. The answer is responsibility. The answer is knowledge. The answer is knowing that someone is going to kick your ass if you fuck up. The answer is you use a firearm in the commission of a felony, and your ass is in the electric chair. We need to have strict laws with definite consequences. You do this, and this will happen. Period.