Correct me if I'm wrong, but the Seuss/Geisel estate has decided to stop publishing some of his older children's books.
If they don't think these are appropriate as children's books, current law allows them to stop publishing. And possibly republishing them with notes about these issues.
Even if it were public domain, or subect to mandatory licensing, and other parties could start publishing, the Seuss/Geisel estate would still be able to recommend and publish some books and un-recommend and stop publishing others.
I don't think it's appropriate to compare their decision to burning research libraries with irreplacable documents.
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