Having said that, it is always informative to look carefully at who benefits from the attitudes - and policies - that emerge from these false stories.
Gareth Hardin of "The Tragedy Of The Commons" fame, for example, was a hardcore white nationalist, nativist and eugenicist. Stockholm Syndrome was invented out of whole cloth to cover up police brutality and incompetence.
The list of empirically false but fun-to-retell stories that are also powerful as authoritarian propaganda is pretty long.