They don't know who he is. American adults are uninformed about most issues and will just parrot what they're told to believe in. Mass media paints him as a bad person so that's his public image.
N = 1 blah blah, but my Dad is a West Virginian factory worker who couldn't name one current Supreme Court Justice (including the one just appointed), but he has spoken positively about Snowden for years.
Zero doubt that the common people of this country have much more affinity for Edward Snowden and anti-surveillance viewpoints than the psychos at the top running things.