Has there actually been any evidence that Harry Potter leads people to witchcraft? In my experience, the only thing that Harry Potter has lead people to do is become writers - I know fair number in their 20s (so part of the main Harry Potter audience) who cite it as one of the big influences on their writing. So surely that's not a bad thing?
Or to read. When the HP books came out, children read only a few books in Germany. Playstation and smartphones were more interesting. Then the kids began to read. Not only HP, but also other books. Even classics, such as the books of Mark Twain, Erich Kästner (the author of "Lottie and Lisa"), and other children's literature. And even adults became fans of the series.
The adult daughter of a friend read the books, and gave it to her mother. She recommended this to me. I was skeptical at first to read a "children's book," but was very enthusiastic as an author when I created the various narrative strings, and how they were interwoven to create tension and curiosity. I immediately recognized that a master of her subject had written the book; and ordered all from J.K. Rowling at that time published books.
No, but making these things attractive for kids is wrong, it's (potentially) dangerous.
You ought to know the Bible strongly advises against these things too.
In order for children to develop well and healthy, they need, besides other things, fantasy. Just as we adults sometimes need (as an escape from reality, for example).
When a child or teenager reads books; who act from witches, ghosts, monsters or extraterrestrials, he or she knows that it is fantasy, which gives new impetus to his own imagination. Some of the best writers, scientists and theologians would not be what they are today without this fantasy (imagination).
As far as the Bible is concerned, the people of antiquity believed in the transcendental. On magic, witches, sorcerers, fortune-tellers, and similar. They did not know better. Today we know better! Today we know that fortune tellers work with tricks, also the so-called "witches", and the magic is only for the show stage.
Who still believes that witches, etc. are dangerous because the Bible warns before them, should ask themselves only one question: Is my faith strong enough, or do I feel attracted by magic?
If one feels attracted to magic (witches, etc.), one does not want to strengthen the faith, but wants the power back over its own life.
Have you not yet noticed that a big part of popular entertainment for kids and youngsters is making the occult attractive?
When the first seasons of "Charmed" ran in Germany, I looked at them. It was interesting how the screenwriter put old mythology in new robes. But I soon realized that they used exactly the same prejudices as all the others. An example:
The Halliwell sisters fought among others against demons. Now, in mythology, demons have never been the evil ones (in the original conception they were counselors and observers of the living), but were made by Jewish and Christian authors. Authors who are also found in the Bible!
Since I found that out, I had never interested to watch the show.