It's designed to promote science and the useful arts by giving artists control over their art. If I decide to create art, but I lose control over it once I decide I don't want to show it to anyone anymore, then that's not really control, is it?
My opinion is that copyright should be limited to the lifetime of the author, at which point it goes into public domain. In this particular case, that would mean the books would have been in the public domain for a long time now and there wouldn't be a controversy over this particular issue.
But the issue could still arise if the author were alive. Imagine Dr. Seuss were alive today and made this decision himself. It's the same controversy: person/entity with control over IP makes a decision on distribution of IP, people get upset. But that's the deal - you want to promote the useful arts by granting limited monopoly rights over art, then you better actually grant limited monopoly rights over art. That means the right to not publish the art.
My opinion is that copyright should be limited to the lifetime of the author, at which point it goes into public domain. In this particular case, that would mean the books would have been in the public domain for a long time now and there wouldn't be a controversy over this particular issue.
But the issue could still arise if the author were alive. Imagine Dr. Seuss were alive today and made this decision himself. It's the same controversy: person/entity with control over IP makes a decision on distribution of IP, people get upset. But that's the deal - you want to promote the useful arts by granting limited monopoly rights over art, then you better actually grant limited monopoly rights over art. That means the right to not publish the art.