The Constitution guarantees Snowden an impartial jury trial on the criminal charges against him. It does not guarantee him the right to have the jury decide whether breaking the law was morally justified or beneficial to society. The Sixth Amendment requires a jury to determine the elements of the crimes; it doesn't constitutionalize every defense a defendant would like to make.

He still accepted their asylum rather than voluntarily going back to the us. His original intention does not exculpate him.

Right? The charge that "he took refuge, incredibly hypocritically" is a blatant lie, and then the GP moves the goalposts. As we all know, including the blatant liar, Russia was not Snowden's destination and he was trapped in the airport because the U.S. cancelled his visas. The claim that choosing to accept Russian citizenship months later as an alternative to spending a lifetime in a U.S. prison is hypocritical is vile.