The kids should not be removing some of their Dad's work. His struggles with alcoholism are well defined in the public and him describing his struggles could help another facing similar problems.
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Why? Because of possession? That's a crummy reason.
Art is supposed to be upheld as on par with 'divine creation' by those that respect it. Literature, being art, isn't different.
in other words, we knew the Ecce Homo restoration was botched because we were able to compare it to the original piece.. sadly we won't ever have the luxury of knowing what kind of hatchet was taken to the memoir after the author's death.