If he didn’t know it was wrong, he is not guilty
Yes! The salient question, the only thing that the FBI is interested in, is what was his intention when he collected those 500 million documents over two decades. If there was no intention to disseminate those documents to unauthorized persons, then he is just a very, very, naughty man , but committed no offenses that a “reasonable prosecutor” would pursue.
We could call it the “Stanislavski theory of criminality,” What was his inner motivation? If inner motivation wasn’t there, then no crime was committed regardless of external trivialities, like say...facts.
https://en.wikipedia.org/wiki/Stanislavski%27s_system