I have a different take on it. Respectfully, stop blaming the victim, and prosecute criminals to the fullest. The guns in your safe, my safe... all of our safes, can be stolen in minutes. Security is an illusion that is frequently overcome by determination and opportunity.
I have two gun safes that both cost about $1500, and have seen video of people opening them in about 45 seconds with a crowbar. They simply dropped the safe on it's back and pried it open.
I agree that this guy made some bad decisions, but blaming him is akin to accusing a cattle rancher of aiding and abetting a cattle rustler for supplying food to criminals.
Wasn't there a guy not long ago that had constructed an actual vault, and got jammed up because someone stole his collection while he was away?
I think they should make theft of a firearm a mandatory 10 years in prison