It isn't really fair to say "most", I know tons of Christians who are big Harry Potter fans, and I have only met two Christians who were really adamantly anti-Harry Potter.

And it isn't ignoring Levitical law, New Testament doctrine clearly teaches that Christians are under a new law, and not the old Levitical laws. I hear far too many people cite that as "cherry picking" by Christians, but it would actually be misunderstanding of Christian doctrine on the part of the one making that claim.