Or maybe, “Don’t be greedy” and/or, “Be wary of strangers”?
Another freeper wrote awhile ago how these stories were a way to tell kids that there are REAL monsters out there in the form of terrible people.
Nowadays they could be listening to “Mr. Ballen”.
(A youtube guy that tells stories of real-life crimes, etc. Does a GREAT job. “Tommy on the outside looked like any other 16 year-old kid, well-like by his friends and family and did well in school....(10 minutes later)... His father was found dead in the garage, and his mother had been dismembered with her body parts scattered around the house...)