> There is a compelling natural rights justification for intellectual property
But Copyright as law is only about 300 years old and wasn't implemented because of "natural rights".
> If people's intellectual property rights are not respected, it will not be profitable to develop intellectual property.
And, yet, a lack of copyright didn't appear to stop people from creating works before copyright existed. And maybe there's more important things for a culture than profit.
Even more so, there are people creating works today who go out of their way to specifically disclaim copyright protection using Creative Commons Zero and similar licenses. So copyright isn't a requirement for creation.
> In this case: you claim that it's important for the public good to move works into the public domain. Well, how is it good for the public to move Horton Hears a Who or Sports Illustrated into the public domain?
Well, in some cases, because that was the agreement at the time the work was created until the law retroactively changed the terms of the contract.
And in other cases, because then the next generation of film-makers gets to make their animated re-interpretation of Horton Hears a Who (or even Horton Hears a Sports Illustrated) without it being illegal or financially prohibitive thus ensuring society more culture works.