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Omega,
I think in a case like this, the parents - if their children would like to read the books or see the movies - should sit the kids down and warn them about sorcery. Remind them that God tells us that witchcraft comes from Satan, and that magic is not something to be messed around with.
Personally, I don't think I'd have a problem with my child watching the movies or reading the books, so long as he/she understands the fact that magic is not okay. I really doubt that I'd allow my young child to watch it, though.
Then again, seeing as I don't have children, I have nothing to worry about.