@Cabin_Mama
What is the definition of "safe guard" a firearm?
There is no requirement, at least in this state, for a gun owner to store firearms in a certain way. It is just common sense, in my opinion.
For example, I believe I follow best practices to store my firearms: if they are not in use, I keep them in a safe, and I keep firing pins/bolts stored in a different place and I lock them, if the firearm is lost or stolen, at least the person that has it will have to get new parts to get it going again. But frankly, if someone really wants to get my guns, they will get them somehow. So what is "safe guarding" a firearm exactly and how do I know if I'm doing it or not, if it hasn't been defined?
It would be very difficult to go after a gun owner like myself if one of my firearms is stolen and used in a crime.
In the case of a "gun shop owner" (I assume you mean the business, not just the owner), there is no requirement by the ATF to store the firearms in overnight safes. During the licensing process, the ATF pays a visit to the place of proposed business of the applicant, and safety is one of the things reviewed, but there is no requirement that the FFL must keep firearms in a safe or locked. If to the ATF reviewer, the place of business is not secure enough, the license may not be issued, until the security concerns are resolved. ATF can pay a yearly visit to the dealer to ensure compliance.
In my opinion, there is no negligence in the part of Sportman's in this case. Their doors are secured and they have an alarm system; the building in general is secured. Obviously something happened that allowed what appears to be easy access during a robbery, but I don't see how they are negligent in this case.