...is that the oil and gas companies were enthusiastic participants in the study, providing the data. Their rationale was one of enlightened self-interest, I'm sure: THEY don't want to get sued if they cause an earthquake, and the USGS analysis will tell them where/how it's safe to drill.
(My source is an interview on either NPR or BBC World News, which I can't find a link to at the moment)
Related: There's a widely-circulated conspiracy theory that the NSA has solved P vs. NP and broken RSA (and most other forms of) encryption. The fact that Snowden hasn't leaked any documents confirming this seems to be to be pretty strong evidence that the theory is false.