With all due respect, aren't the hypothetical abuses of Snowden files ultimately just FUD at this point? Snowden's public statements have given the impression that he cares deeply about the U.S., giving me the impression that he probably isn't going to intentionally release the documents to those that would seek to abuse them.
However, I would be very uncomfortable with him giving full access to the unencypted stash to a place like Wikileaks. But still, I think innocent until proven guilty of mishandling his stash should apply.