extremis? And the petrodollar is useful to slavers, murderers and colonialists; Show me a currency-issuing superpower with no blood on its hands.

Much like piracy prevented the most deranged attempts of the copyright industry - cyber-currency may put limits on state seizures and overtaxing.

At least for now BTC isn't anonymous (leaves a public paper trail) so it's not so perfect for crime. And an anonymous currency will still be liable at the entry/exit points.