Please define your terms, and differentiate what you are calling fairy tales from myths, legends, folktales, and even wonder tales. If you can't (and we know you can't – no one has been able to), do at least acknowledge the fuzzy, overlapping, organic scope of the concepts.
There is no such thing as a fairy tale. There are, however, many fairy tales. – paraphrasing Jack Zipes (I think) from memory.