Gatx said:
What he did was wrong, or at least against the law. That said, sometimes what isn't lawful might be the right thing to do, BUT I think you do need to face the consequences. Also just because no one has been harmed through any direct connection to those leaks doesn't mean that no one was put in danger, and it doesn't change the fact that the leaked information did end up in the hands of the enemy (well, provided the enemy can access the internet).
Also he should've leaked it to anyone but Julian Assange, and I think he tried, but I just don't like the concept of WikiLeaks. It's a who watches the watchmen kind of thing, though maybe it needs an extra layer of "who watches" to apply to them?
Essentially this.
It was against the law, but that doesn't mean it was morally "wrong" (or at least not 100%)
Whether the law is "right" is up for debate.
He leaked information. Not in attempt to harm anyone, but since leaks CAN be used to harm people, they can't just say "it's okay." But this DOES NOT mean he is instantly a traitor, we simply need to give him due process.
Same with Snowden really. Albeit Snowden looks more guilty because he fled, but whether or not he is justified in his lack of faith in our justice system is up to opinion. Manning stayed and faced trial.
The label of traitor is a misnomer.
"One who betrays one's country, a cause, or a trust, especially one who commits treason."
They betrayed the trust of their organizations, but they DID it in support of the cause of what they believed in. They acted against parts of their country in favor of it.
If they had accepted bribes for the information, I would not feel any sympathy for them, but other than the focus they have gotten, they have not gained.