The most popular fairy tales also have been modified to be more kid friendly. Nobody saved Little Red Riding Hood. Sleeping Beauty wasn't kissed, she was raped in her sleep and gave birth; it was her child sucking the needle out of her finger that woke her up.
These used to be more than just stories for kids, but modern fairy tales are rarely ever told to an adult audience anymore. For many fairy tales, the happy ending was added centuries after they spread.