The congress members are part of the problem, as he's gone over. They approved the illegal problems and were looking to bury public mention once they figured out all the scope of the programs since they were implicated and didn't want blowback during their own elections.
You keep saying you "don't like fleeing", but you haven't provided an alternative that would both provide real change and not have him being threatened with the prospect of a firing squad.
https://www.pogo.org/analysis/2016/09/busting-myth-of-whistl...
The espionage act under which he'd be charged doesn't allow a public good defense to be used in court.
https://www.justiceinitiative.org/voices/why-snowden-won-t-g...
What you're asking for structurally can't happen in the US legal system.