You can't say that leaking classified documents is always wrong. There have to be times when leaking classified documents is right.....for instance when containing evidence of grievous crimes. After all, many of these documents were only classified in the first place to hide the wholesale breaking of laws, the Geneva convention etc. going on, so making it impossible to reveal classified documents for any reason just gives them a simple and easy way of hiding crimes.
I expect the judge may have agreed with you, if that is what he leaked. He didn't do this, he leaked as much of everything that he could, and trusted Assange to filter out what is sensitive, like names of translators working for the military, from what is 'newsworthy', like video of civilians being massacred.
Manning's job for his country was to protect that sensitive information from being disclosed, which he really failed at.