From the first link: "Bitcoin has achieved a level of comput[ational power] that no single nation state can overthrow it through computation alone. The effort to do so would require a massive covert operation of chip fabrication. Then, the coordinated assault would give them over the next block for 10 minutes, until we kick those bastards off the network... they would be revealed, they would have lost billions of dollars doing this, and all they would have got was a double spend"