them to stop by when you're not around and steal it? Is that the rule? Show off something you bought and you deserve to have it stolen from you? That's a great precedent.
Two things can be true at once:
1 - it can be true that it's annoying when someone shows their flashy things.
2 - it can still simultaneously be true that it is wrong when someone steals it and the person stolen from is not at fault.