Right, I get that. But my point is thus:
First, who cares? Honestly, of all the things I'm upset about, pretty much the bottom of the list is "pictures from Tor get mirrored in an NSA facility". The "terrible" things about child porn come from it's production, distribution and sale. None of those things are happening by it getting picked up in a dragnet and put on a HD. No one's going to be motivated to stop the government over CP if they haven't over privacy.
Second, child porn is bad. But do we really have to take their bullshit strategy of "OHMHYGOD THE CHILDREN!?" when "OH MY GOD, ANY SENSE OF PRIVACY?" should suffice?
tltltl;dr: If a "legal technicality" were going to trip up the NSA, it ought to be the Fourth Amendment.