If you read what the Wash Post reporter said Snowden tried to get him to release the entire slide deck. Why couldn't he put it on the internet? It is also interesting to me that he said this required a lot of preparation. If he had the accesses he claimed he had copying classified slide decks would be risky for him but not something that would take a long time.
He also claimed that the NSA could track all emails in the USA and he (or an analyst not sure what he meant) could access the email of the president if he had the personal address. If that is the case, surely evidence of that type of deep telecommunications interception would be more important than PRISM especially since he raised that claim specifically to explain why he did it. With the access he had it would be easy to prove.
I don't know what to make of his decisions. Not saying he isn't who he said he is but I think there are a lot of unanswered questions.