WikiLeaks' decision to accept bitcoin seems to be the reason Satoshi left the project when he did. This is his penultimate post:
It would have been nice to get this attention in any other context. WikiLeaks has kicked the hornet's nest, and the swarm is headed towards us.
Only four months later, Gavin announces he's visiting the CIA. Do you think Satoshi was pissed at WikiLeaks?
That's just pure speculation.