Cider House Rules

A question for those of you who have seen the movie The Cider House Rules. (I haven’t read the book, so I don’t know how different it is.) It seems pretty clear to me that the “Cider house rules” are a metaphor for heteronomous rules, or rules that come from outside us. Do you think that Irving’s purpose (he wrote the screenplay, too) is to show us what happens when we get rid of external rules? Or is he advocating throwing them in the fire?