It's always sad to hear about these things happening
I agree that a kid that young shouldn't have a gun in the first place. There's just too much room for error. And if parents insist on giving their kid a gun, then they should have the common sense of taking safety precautions such as not leaving guns laying around and not having them loaded. At that age, a kid is not going to know any better, and they're impressionable, and much more liable to do things because they see their parents do something. That does pose a question about the parents though. If they've left their kid's gun laying around loaded, I wouldn't trust this family with guns, period.
Reminds me of a story I read a long time ago. Must have been in 2009, where a father took his kid out to a gun fair and let him shoot what must have been a semi-automatic, and the kid couldn't handle the recoil and wound up shooting himself.