Obsession is what many Harry Potter fans are all about! I have friends (kids and adults) that dress like the characters, have HP parties, go to Harry Potter at Disney World every year…
Some of the “Harry Potter games” that kids played on the playground at my little girls school were a bit strange. My daughter thought they acted really creepy.
Frankly, it seems kinda weird. What the weirdest thing to me though is people that love HP insisting that people who haven’t read the books absolutely must and are depriving our children of this and that. I refuse to enter into those conversations any more.
(I have not read any of the books or seen any of the movies. I have four children and they were not interested so it never came in the house).
As I noted before I was really too old to play “Harry Potter games” but I did spend a lot of time on HP websites discussing theories, even wrote some HP fanfiction, etc. I certainly was a “Potterhead” at one time. I wouldn’t really call myself a “fan” now and I do think the latter books were not well edited. I also don’t think JKR has much talent in writing romance (though ironically much of fandom activity was due to “shipping wars”) and I think it might have been better to leave most of it out.
However, interestingly, I recall I got into HP about the same time I got into Jane Austen’s books (yes I was an “advanced” reader, I actually read The Scarlet Letter BEFORE I was assigned to read it for school). Some of you may recall a Jane Austen “boom” around the turn of the century (1990s-2000s), as the *Pride and Prejudice
miniseries, the Sense and Sensibility *and
Emma movies came out. I was on a JA fansite too and I recall one teenage poster stating her parents wouldn’t let her read the HP books.
Well, I didn’t think it was my place to debate her, but if you merely look at “content” then JA is problematic too though obviously this girl’s parents let her read those books. Characters in both P+P and S+S have
gasp sex out of wedlock. S+S refers to a “fallen woman” who has a daughter out of wedlock, who herself goes onto have a baby out of wedlock. And in Emma, one of the major characters, Harriet, is actually
gasp born out of wedlock. Mansfield Park features adultery, and one of the characters even makes a joke about homosexual sex!

Oddly, “Persuasion” doesn’t have too much of that kind of content but I’m sure I could find some if I looked.
And of course, many secularists would be happy to point out that the Bible contains plenty of references to adultery, incest, rape, murder, yadayada.
The issue here is really not “content” in terms of what themes are covered in a story, but how are they covered? Is sexual sin and violence lingered on in graphic detail? In the case of “magic” I don’t think the mere use of “magic” in a book makes it inappropriate, just as the mere reference to sex in a book makes it so. Lydia running off with Wickham and living in sin with him, is a major plot point that actually sets up the happy endings for the major couples. I doubt most people reading P+P would find Lydia and Wickham to be people to emulate.