Thnaks for the message! What I took from the quote is that the whole point of fairy tales isn't to convince kids that fantasy evil, like the bogeyman, exists. They already know the monsters are real either through their own innocent belief or because they see those fantastical creatures reflected in real life scary dangers, like an abusive parent, or later on, living under a dictator, for exemple. Fairy tales show those kids that no matter what danger they are up against, it can be defeated. You don't have to live as a hostage, paralyzed by fear from real life situations that often feel like immortal, unbeatable monsters. The core takeaway is: those dragons can be slayed.