Partially inspired by /u/damnbiker and their comment found here. Why as a society are we encouraged to lie to children? Of course there is Santa Claus, the Easter Bunny, the Tooth Fairy, on the other end of the spectrum to boogeyman. There are also other long reaching traditions like the Elf on the Shelf, which dates all the way back to 2005 or so.
We surround them and ourselves with all sorts of fantasies: books, TV, movies, video games, but we don not pretend any of that is real.