Garrett's Principle
Let's not mince words: you're a thief. You can walk into just about anybody's house like the door wasn't even locked. You just barge right in and start looking for stuff. Anything you can find that's not nailed down is yours to keep. You will often walk into perfect strangers' houses, lift their precious artifacts, and then chat with them like you were old neighbors as you head back out with their family heirlooms under your arm. Unfortunately, this never works in stores.