I used to, some jobs back, work with classified documents. It is Not Possible to make "honest mistakes" like this.
People go to prison, and not "club fed", for "mistakes" like this. Not threatened, not some ignored clause in one's security agreement, they really get locked up in grey cages for this sort of thing.
For the sake and the respect and the honor of all the people who respect their security oath, I want his hide. If he thinks he did the "right thing" anyway, good for him. But civil disobedience is not a "get out of jail free" card, nor should it be.
(And dont start with me about Joseph Wilson and his wife. They both flat out lied about their little trip to Africa, and their "investigations" there.)