This is a tired trope. Even if it's true that belief in a cause requires a willingness to die, that doesn't mean that it requires one to actually die. I don't see how Snowden staying around for a life or death sentence would have done anything useful for his cause. It's not "cowardly" to want to avoid life in a federal prison or death by lethal injection.

You're just spouting soundbytes. You restated the "fled into the arms of our adversaries" line nearly verbatim but ignore the fact that there's nowhere else to "flee" because any country not willing to extradite him to the US is de facto "anti-American". You say he damaged our ability to collect data but don't have any proof. Was it embarrassing to the nation? Sure. Is there proof that it actually harmed us? I'm not aware of any. You also call him a coward as if level of bravery is relevant to treason as opposed to a pure appeal to emotion over logic.