What did they do in order to promote peace?
Even if you hate what Snowden did, he is a whistleblower in the sense that he saw something he thought was wrong, and carefully pulled enough data to prove it without endangering anyone's lives or doing unnecessary damage to his country.
I could totally get behind Assange's and Snowden's nominations (but like others have said a nomination for this Prize is meaningless), but Manning's seems ridiculous.
I'm unclear why the challenges with the Manning release begin with the 22yo w/o enough experience to make better judgments and not the scores of military and political careerists who created, enabled and hid the atrocities.