The difference between a Whistleblower and a Traitor is determined by whether the leak benefits the home nation or it's enemies.
Manning leaked confidential information that harmed the US, to no good purpose other than his personal view of right and wrong, or the satisfaction of his own ego. He also chose to do so anonymously via a website run by a probably rapist, instead of publicly going to the papers. I'm not defending what the US has done to the Afghans, hiding massacres, bungles helicopter strikes, but I see no point in releasing the information, other than to harm the US and make a diplomatic resolution harder. Leaking the diplomatic cables was even worse, nothing revealed other than salacious gossip and embarrassment caused to the US that makes the work of diplomats harder.
If Snowden had stopped at the revelation that the NSA was bugging US citizens without warrants and snooping their emails he'd be a whistleblower - but he had to release more, the moment he started exposing spying against foreign powers he became a traitor.
Everybody bugs everyone - the Brits bug the Americans and vice versa - 50 years ago it might have been true that the Aussies didn't bug the Brits, but today I expect they do - we have enough divergent interests that it seems only prudent. Face it, all the screaming the Turkey, the EU, whatever, is manufactured outrage for the benefit of the general public.
As to punishment - I'd say Manning was stupid, I'd give him life, parole after 15 years, Snowden should have known better - life, parole at the discretion of the State Department after perhaps 30 years. The fact that Snowden has fled to Russia and has been allowed to apply for asylum tell you who has antics have benefited.
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