To most, it would seem obvious that his morality is non- conventional. Conventional morality would say that this act is against the law, so it is immoral to do it. Conventional morality is focused on the individual's place in societal norms. Those who describe him as a High School dropout, an ignoramus, (how could Booz have hired this guy?) seem pretty clearly to view him as backward, perhaps unable to evaluate the consequences of his actions, motivated by some need for individual glory.
There is another option, however. His may be a Post-Conventional morality, which is driven by a higher and deeper sense of morality which differentiates from the societal, and reintegrates into a larger system of meaning. Reports from those who actually spoke with him about the leak suggest a very thoughtful deliberative man who was very careful about what he chose to release an what he didn't.
Hard to know, though, from limited information.... What is fascinating, and what is important to know, I think, is how this man thought about what he was doing. What is clear, though, is that a post-conventional morality runs ahead of the societal morality under which this man and other Whistleblowers will be tried. How do we evaluate one's motives, and how are these motives able to affect the meting out of justice?