The problem with your "personal" documents argument, is that anything marked with government classification markings can't be "personal" documents.
We have the case of a college student who wrote a paper on how to make an "A-bomb", that he compiled from non-classified sources, yet the final product was "classified" under
In 1976, John Aristotle Phillips was an underachieving student at Princeton. In order to improve his grades, he wrote a term paper on nuclear proliferation. The report included designs for an atomic…
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An underachieving Princeton student wrote a term paper describing how to make a nuclear bomb. It was seized by the FBI