Snowden committed crimes.
For the rule of law, he should be tried and sentenced to the prescribed penalty for those crimes.
For the rule of law, he is innocent until proven guilty.
I'm glad we know what he told us. But you can't not prosecute people who undoubtedly did commit crimes because you agree with their stated motives.
The only person who can know if he 'undoubtedly' did commit a crime are the judge and jury in court. If you let that go the second you think "He don't look right..." or "Well, I saw on the news that..." then you're throwing the whole judicial process on the scrapheap. This even applies if you "saw him do it" a.k.a. "I (think) I saw him do it and I'm (pretty) sure he did" - and even if he confesses.
It may seem like syntactic sugar but you'll do yourself a lot of good if you start inserting "allegedly" into any statement you make about an individual pre-trial - and subconsciously do so when reading other people's information-free opinionfacts. For the record I think he's guilty as sin of the law, but that the law is probably wrong.