Your starting point was that they were collecting† data that could jeopardize national security††. You clearly based that argument on the idea that their own recruiter mentioned "10s of gigabytes a day".
Now, in true message board geek fashion, you're going to steadily move the goalposts. What? They're not collecting messages? Well then they're processing messages! They shouldn't be doing that either!
The problem with this tactic --- make a spectacularly unsupported assertion and then back off it in a series of non-concession-concessions --- is that you cease to be credible. Is this what you really think? Or will you re-harden your position if e.g. it becomes clear that they're not even seeing the keycodes of the keypresses, but rather using an API that could conceivably allow them to get them.
† Your word.
†† Ibid.