Finished The Philosopher's Stone. I enjoyed that very much. On to The Chamber of Secrets.
I also saw a commentary from someone on a mailing list I belong to. She was talking about all the behavioural inconsistencies of the adults (both in the movie and the book). "What message does that give kids when they do not punish X?"; "They should not have punished Y-behaviour so severely. That's so inconsistent."; etc. etc.
All I can say is perception is the key. Adults can seem inconsistent to a child. Children will sometimes think they're being treated severely when, to any other adult, the punishment really isn't that bad. Sometimes children will think they're really in trouble this time and all they get is the proverbial slap on the wrist.
And the Wacky Bible-based Religious Extremists accusing J.K. Rowling of promoting Witchcraft and Satanism can shovel it.