Don't mistake legality for morality. By a lot of people's estimations, they're exactly reversed in this situation with Snowden breaking secrecy laws by exposing "legal" surveillance.

Plus, it's not even clear the government is acting legally here. An excellent case can be made that mass surveillance violates the Fourth Amendment, and if the CIA planned anything other than bringing Snowden back to a public trial in the USA, that would be a violation of the Sixth Amendment.