If you found a twenty on the floor in an abandoned alleyway, would you hand it in to police, or would you steal that money?

If your first thought was "It's not stealing for such a small amount", or "It's clearly been abandoned, so it's ok to take it", then you're the target audience for being kept honest.

Your other point is spot on: the aim is to increase the friction of entry and raise a mental barrier in the mind of the subject which results in an outcome you would prefer (no break-in).