Sure, have a healthy suspicion of anything you hear from the government, but these complaints just don't make sense.
>> These hidden officials also claim that American and British agents were unmasked and had to be rescued, but not a single one is identified
What, so you expect the government to publish the names of former covert agents previously operating in hostile countries? How about their home address while we're at it?
>> There is speculation that Russia and China learned things from obtaining the Snowden files, but how could these officials possibly know that, particularly since other government officials are constantly accusing both countries of successfully hacking sensitive government databases
One of the whole points of an intelligence organisation is to know what the 'enemy' knows and how they got that information. There are loads of ways you can find out how knowledge came about, such as observing coincidental timing (china discovers several things at the same time what were all in unreleased snowden files), asking your source, or obtaining secret documents from your opponent describing how the information was obtained.