If literature truly reflects society, then the end of the Harry Potter series spells trouble for us all. Because, after 10 years, 4,195 pages, and over 325 million copies, J.K. Rowling's towering achievement lacks the cornerstone of almost all great children's literature: the hero's moral journey. Without that foundation, her story – for all its epic trappings of good versus evil – is stuck in a moral no man's land. To be clear: This isn't a critique of Ms. Rowling's values. It's a recognition of a disturbing trend in commercial storytelling and Western society. For those who've yet to finish...