Nobody ever seems to be fond of the idea that the NSA could of course very well have invented the Bitcoin project in the first place. Really why not?
Most arguments are about "why should they invent an open source project, that could interrupt the banking system?", which is understandable. Shouldn't they protect their system including national banks?
I also find it unlikely, but still possible, that Bitcoin was invented by any of the known agencies. In-Q-Tel seems to like Bitcoin for some reason for example.