The Elder Scrolls III: Morrowind. It happened when important NPCs died, rendering unfinished or future quests associated with that character impossible to complete or start; iirc essential NPCs didn’t have immunity to damage and death in Morrowind like in later Bethesda titles, so these NPCs were protected only by the player reloading their save after getting this message upon the essential NPCs’ death.
Training people can be harder when the trainees have to unlearn bad habits or knowledge. Ask anyone who has tutored previously self-taught students an artform or craft.
In some ways, media exposure can help to introduce broad concepts, and sometimes there are excellent examples in media (My Cousin Vinny and Legally Blonde have been used in some US law school course curriculum to show how the parts of the judicial system are supposed to operate, iirc), but oftentimes preconceived notions can hinder training for the real thing.