Also, the OP's mention of fairy tales? The thing you have to note is that all of the ones with bad endings (that is, pretty much every single one of them) fit into the category of ones that include large amounts of sex, violence, and blood and gore. And these were the original tales, the ones that were first told in years gone by, and they were never intended for children specifically (though it wasn't a problem if kids heard them) - they were a form of entertainment in the days when we didn't have games or TV or even books commonly available (and most people couldn't read anyway). It was only much later, when Charles Perrault (and even later than him, H.C. Andersson and the Brothers Grimm) got their hands on the stories that they started to become diluted more and were made accessible for kids and reworked as children's tales. Nowadays, society deems them to be kids stories and anyone over a certain age who still enjoys fairy tales are looked down on as weird, but seriously, these tales were meant for adults in the first place...