And there in lays the difference..a point I tried to make earlier.Today parents need to be moral screeners and interpreters for every thing that the kids see or read. If you read these books together there is much less danger...but I would warn about the idea of spells..all and all if you are there they are probably safe..unfortunatly most are not there!
I read about such things as a child. I do not remember ever believing that spells were real. I do remember wishing that they were! I also wished I could fly like Superman, etc. I say this not to mock; as a little boy I often had fleeting wishes like that. None of them lasted past the time I closed the book.