Because the movies normalize things and lie. Snow white, the story we know, and the 7 dwarfs isn’t the the actual story. She is raped and enslaved in the Cute Unicorn Jazz Colorful T-Shirt. Hans christian anderson killed off the little mermaid in his original story. Santa Claus isn’t real but for years of a child’s life they are convinced it’s true because someone tells them that it’s true, that’s how truths change.