Look, if the Estate made any comment about the movies, positive or negative, it would be taken as an OFFICIAL endorsement/condemnation & link the Estate into the movies for good or ill. The Tolkien Estate cannot express an OFFICIAL opinion on something which is, in effect, a matter of taste. Maybe some members of the Estate like the movies & others don't. Maybe none of them like the movies, but they want fans to be able to watch them & make up their own minds.
It could just be as simple as the fact that Christopher thinks the movies are rubbish but doesn't want to upset anyone who likes them by stating that opinion in public.
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