The NSA operates a Tor exit node at Georgia Tech, and likely at other research institutes and universities. The fact of the matter is, people who use Tor are the ones trying to hide from the government, and it only makes sense for the NSA to run Tor exit nodes and analyze all traffic passing through them. You probably have more privacy by not using Tor at all.
Can you cite your source regarding the NSA operated Tor exit? I do not mean this to be snarky -- if you have a legitimate source other than hearsay, I'd love to see it.
Is it really that hard to believe? Considering that the Georgia Tech Research Institute (GTRI) gets mostly DoD contracts and research grants and a lot of those contracts are for classified projects.