Classification is a red herring.
the issue under the Presidential Records Act is that these documents belong to the American people, not to the President. Unless they are private papers and the Archivist has agreed that they are, Trump should not have had them.
. Under the PRA, the official records of the President and his staff are owned by the United States, not by the President.
The Archivist is required to take custody of these records when the President leaves office, and to maintain them in a Federal depository.
No - classification is the LAW they’re accusing Trump of violating. If all papers (as you suggest) belong to the public than NO President should ever have possession of them after leaving office.
Except they do… they ALL do…
Which leads me to question your reasoning.
Yes - all OFFICIAL GOVERNMENT correspondence belongs to the people - but that doesn’t include items of a personal nature. And, of course, Hillary Clinton never did official government business on her private e-mail server…