To add to this even more, Lulzsec got outed by a member who chose to cooperate with the FBI, and in doing so got a reduced sentence. So in many ways, your security is entirely dependent on the security of everybody else - if they don't hide their identity well, then your identity can be in jeopardy too.

If someone starts cooperating with some type of law enforcement you're screwed, and if anybody gets caught and is facing a 50 year charge unless they cooperate, you can probably bet on which one they'll choose.