I finished the three Potter books I got a few weeks ago and am now a third of the way through the Deathly Hallows. I'd seen all the movies previous to reading the books (with the exception of Half-Blood Prince) but hadn't realized how blatantly allegorical the books are about hate-based supremacism, with the last book pretty obviously drawing inspiration from what happened in Nazi Germany.
So in addition to being entertaining pop literature, the book's have a pretty important message that any youngish reader could benefit from encountering.
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