well they are ostensibly witches and warlocks which are commonly recognized occult figures and they are apparently the "good guys" in the Potter books. as the Pope, when he was Cardinal Ratzinger said, it tends to blur the distinctions and i just don't think kids need that. i think bright lines are goods when teaching kids. I am far from a book burner and don't begrudge anyone reading it, but i just don't like the idea of it, basically.
I mean, realistically most of the fantasy type literature deals with magic users on some level be it Tolkien, or David Eddings etc....