He may be a traitor to that vile and heinous entity known as the United States, but he's a godamned hero to the rest of the world for exposing the crimes against humanity that the American people are allowing to occur in their name. It is the American people who cannot be trusted, for they have allowed their government, for decades, to get away with countless series of crimes against humanity, and done nothing to stop its military industrial masters from having with the world as they will.
So if you have a strictly America-first orientation towards the world, feel free to continue the justification. But if you can see the world outside the pretty box, Snowden is one of the most important figures in the world today. He represents what America used to be: brave, honorable, and doing what's right in face of the certain personal danger one faces when going up against totalitarian systems of control which have the purpose of enslaving us all.