I respect his desision, since it's the only way for him to act the scripted Malfoy. I, for instance, refuse to watch any film versions of Shakespeare, or other productions, so as not to impaire my interpretatoin or vision of the roles that I play on stage. It prevents you from doing something that would seem natural with your knolege, Say, the book Malfoy may have had some experiance that the movie Malfoy has not, and therefore the movie Malfoy cannot base any of his motivation or action on that experience. Also, many actors will not read the script for a group of movies before finishing the one before. It's to prevent anticipating things. For example, being mad at a character for something you don't find out that he did until the next movie... or, knowing that his character will die, and acter might overact, knowing it's his last in the series. Any of these things could really ruin a film or play, and must be avoided. However, some actors can arange things in their minds and block out distracting information, but that's really hard, and manny aren't up to it. At least he has not shown total indiference, he said he might read them "Someday," That's more than some people!