The majority of fairy tales (as told throughout human history) do not have happy endings. They were typically told to teach or reinforce hard social truths to prepare young people for the world. The “fairy-tale ending” is really an anachronism of modern, capitalistic story telling. Happy fantasy sells, and reinforces myths that benefit the elite, such as upward social and financial mobility (see Jane Austin, or every Disney movie), and the opportunity to become part of the landed gentry. The belief that everything always works out is itself a major piece of the capitalists propaganda machine, and because we fall for this, we keep making decisions against out best interests - We are all just one fateful encounter away from becoming rich or famous after all.