I would beg to differ. A person in the performance of rtheir duties may come upon and obtain classified materials legally, but they in turn are not legally allowed to release that classified information to a party that is not legally allowed to have it. Like I said before, receipt of stolen property is still a crime in many jurisdictions.
Honest Judge, I didn't steal that car, I just bought it from the guy that did steal it. How many people are charged with receiving stolen goods that should be innocent. Wikileaks new it was classified information so they are just as culpable.