Edit: I should add that my suspicion came from noticing that the vast majority of the comments when this was first posted seemed aligned in favor of the NSA's mission.
It wasn't the presence of pro-NSA comments that was interesting but rather that these opinions were the overwhelming majority. This is, of course, how astroturfing becomes effective, it is not the rhetoric that is important but the cognitive bias imparted by the facade of so many people falling to one side of an issue.
This is of course, only a suspicion, but it seemed worth noting.