How many laws do we already have on the books that could be applied to any negligence in cases such as this?
How many that cover reckless endangerment? Child Abuse?
Rather than run out and pass another law, just use those already on the books that apply.
As for another state law that would require securing firearms, there is already a Federal Law that requires trigger locks to be provided at the time one purchases a handgun. More laws won't make people use them.