Example about the availability of publicly available classified information: During the time when the Wikileaks stuff was first starting, Military personnel were instructed not to read articles or even headlines about Wikileaks, because they might contain classified information. Given that there would then be an issue with "need to know", reading the newspaper could inadvertently cause one to violate policy, and in turn require the violator to file a report on the matter. Rather than deal with however many reports, people were simply given a lawful order: Do not read any information pertaining to the subject.
Anyway, back to the point about nerds: If a guy is attempting to rotate the turret of a tank he spent 1.5 years grinding to get, and he knows that in real life his turret should rotate at a certain speed, but in game it actually takes longer to turn, and he dies as a result, the chance of him whining about it online is probable. Rinse and repeat this a few hundred times, and cost him potentially 10-20 million Silver Lions (free in-game currency) in repair costs, lost battles, etc. then you better believe he's going to get really salty about it. He's either going to say some things he shouldn't be saying (unlikely, but not impossible), or, he's going to find and link to documents that shouldn't be publicly available.
In turn, other nerds will notice this, report it due to the policies around classified information. Eventually it becomes a big to-do about something that was already accessible, but not necessarily well known.