I can't fathom why you wouldn't be able to see it. Snowden "purposely and consciously" undermined intelligence activities designed to protect the USA, "acting to aid its enemies."
To keep this tied to Hillary: again, the difference is intent, but the reason Hillary's actions are still pretty bad and potentially punishable by prison time. For example:
http://nypost.com/2015/04/23/petraeus-to-be-sentenced-for-leaking-classified-material/
David Patraeus mishandled/disclosed classified information as part of aiding a biographer (who he was sleeping with...). He probably didn't even intend for the information to get out and certainly didn't intend harm to come to the US, but that's still serious enough that he's going to jail. His actions and Hillary's as pertains to her giving her lawyer a copy of her emails appear to me to be roughly equal. I see a wide range of potential outcomes for Hillary, from nothing to jail time.
For Snowden or Hillary, no, it really doesn't. The crime starts and ends with the initial disclosure of the classified information to unauthorized people. Yes, it is possible that the people it is disclosed to commit their own crimes - and in the case of the media, that can be complicated - but it doesn't have much impact on the person disclosing it.
Nobody is claiming he
wanted to aid the USA's enemies, only that he
did aid the USA's enemies. It doesn't matter if he was legally or morally right in what his objection was, he still did it.
It is also worth noting that Snowden did not narrowly focus his efforts. He may have disclosed as many as 1.8 million documents. He went after the program he didn't like by undermining it directly - instead of just exposing its existence, he released its results:
https://en.wikipedia.org/wiki/Global_surveillance_disclosures_(2013–present)
Look, I was in the Navy and for a time an officer candidate. We took ethics and morality classes in addition to attending weekly (monthly?) seminars outside of the normal classes. The issue is clearly a really big deal in the military because there is a push-pull particularly with officers between responsibility for following orders and responsibility for upholding the Constitution. We were taught that an officer is duty-bound
not to follow an illegal order. Refusal to follow an order is alone a difficult thing that can get you courtmartialed. Hopefully, the court recognizes that the order was illegal. But there is still a huge gulf between refusing to follow an illegal order and refusing to follow an illegal order
and then telling the enemy about it.