Even if government employees were protected for blowing the whistle, what about the 690-something thousand documents that had absolutely nothing to do with anything sinister? Why didn't he even make the slightest attempt to bring light to the issue through official channels? You can't go to court and say that the system would have failed you if you didn't even give it a chance.
I'm not saying he deserves life in prison or anything, but make no mistake, he's a traitor, not a patriot.