Given the damage he's done to the US and the West, he will suffer consequences, there's no doubt about that.
While it raises important issues, I'm struggling to find sympathy for him personally, as he has committed an extremely serious act of treason. By doing what he did, he's ended himself as surely as if he'd put a gun to his own head. Except he'll probably have the US government do it for him (or if he's lucky, life in supermax).
You can't do what he did, and not expect consequences.
Per Article III Secton 3 of the United States Constitution (emphasis mine):
Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort.
As Snowden has taken care to NOT release material that would put people in harm's way, he has done nothing to levy war against the United States, nor has he adhered to their enemies or given aid and comfort. What he's done is illegal under current laws, but it is NOT treason. He acted upon a moral duty to the ideals of the Constitution to expose government wrongs, and in so doing, pissed off a lot of powerful people. THAT is why they want to crucify him - because he DARED believe that the Holy Administration of Purchased Officials should be held accountable for their actions.
If Snowden committed treason, then what does that say about Bradley Manning, who threw a temper tantrum and gave a cache of whatever classified material he could get his hands of (damn the safety reprecussions) to an asshole with an ax to grind? If you believe Snowden a traitor, then Manning is one as well.