Bear in mind another point - believing Snowden needs to stand trial doesn't necessarily presume a belief that he's guilty, or should be punished, either. Americans also tend to believe the justice system works as advertised.
As a matter of order, people should only stand trial if the government legitimately believes them guilty and the government believes it can prove this to a jury.
Trials aren't for finding out facts or uncovering the truth. They are the formal processes that a government must do after deciding that a citizen deserves punishment to actually effect their decision.
I for one feel he should not be punished under whistleblower laws, but I would be open to a proper trial. I would like to see that discussion in open court, not a secret tribunal where the outcome is only reported by the government doing the prosecution.
Which is why I think he should not return to face trial, because I think there's no way he'll ever get a fair and open trial in the US.
