Thats horse crap. Not only does it all sound very suspicious, the fact that they are not charging this guy is a crime in itself.
I keep my loaded .45 in my night stand when I am sleeping. When I am awake, it is either on me or on top of the fridge towards the back. I raised my girls from the time they were able to walk and communicate to know the basic kid safety rules. At 6 and 3 they both know the rules when it comes to dads guns. I have had one incident where I caught my 6yr old in the vault, hands in her pockets looking at her rifle. After the talk she has not done anything like that again. She knows she is not allowed in the vault without dad, but all she has to do is ask dad. But being raised in a family surrounded by military guys and cops, and hanging out after school in a gun store the curiosity isn't there for them. For them it is just another tool like a hammer.
Having a firearm is the right that carries with it the greatest amount of responsibility. People like this who dont keep it out of reach of kids, or people who dont educate their kids about them should pay for their mistakes.