The only thing is, the employee are pretty much just asked to sell you anything as if it were worth it and if your life depended on it. That's not how you do business, that's forced suggestion. But i guess if you can find someone who won't, then you're golden. But even the best of employees will resort to it.
They can lie and say what you want to hear, and even if you check their background and its good, they still can deceive you. I'm not saying you're wrong, just that you can't always avoid it happening. It will happen, all you can do is try and recover, but a small theft is nothing to cry about. You hear of these kids who stole a bunch of games off the shelves, but turns out they were only display cases lol.
I do feel sorry for him though, he had good intentions and i'm grateful he helped me. But yes, it was an action that could have been thought about.