This is quite the hypocritical statement coming from the FBI. As far as I can tell, the only difference between Anonymous, Lulzsec, and the FBI is that the FBI act by executive fiat. I don't support Internet vigilanteism, but I also don't support the concept of the FBI as an untouchable force who are no longer held accountable by the public they are theoretically serving.
At this point, I'm not sure which one I find more scary.