The guns were locked up. Locked store, locked case. I used to work at the Cabela's gun counter in WA, and as was mentioned to put all those guns back in the vault every night, and then put them back out in the morning would be impossible. Just trying to keep the display cases/racks full was a daily chore. By the time you put half of them away, it would be time to start taking them back out.
So the "it's their fault comment" was sarcasm relating to several previous comments where some members blamed gunstore owners for thefts where they didn't put their guns in the safe every night.