I think the ones that do seem legitimately disappointed do break your heart a bit, and I love the ones that you love, Lilly, where they are so sweet or you can see them using strategies to deal with disappointment (which makes me happy as a developmental psychology who studies children's emotions). But some of them just seem like entitled brats who have some real age-inappropriate emotion regulation issues. Good luck with those kids! Maybe this could replace the marshmallow test for self regulation.
With Santa, I had been a skeptic, but even though I never remember a time when I believed in God, the Easter bunny, the tooth fairy, ghosts, angels, etc, for some reason I did actually believe in Santa Claus. I was so ashamed and pissed off with myself for believing once I found out the truth, and slightly irritated at my parents for 'lying'.