"While sup_g may indeed have been a "credible threat," he was in the end no match for the overwhelming federal resources of the FBI agents hunting him down. Over the last month, federal agents staked out his home in Chicago constantly, dug up old police surveillance records, tapped his Intern'et connection, used directional wireless finders to locate and identify his wireless router, and relied on Sabu back in his New York City apartment to let them know when sup_g went on or offline."
This is the one thing hackers will never get. You get the FBI on you and guess what? You're one person. They can assign hundreds of people to the case, bring down a wealth of resources to get you, and they go 24/7 until they build an airtight case on you. Not much you can do at that point but play their game.
As Reiser case showed, some very smart people think that they are so smart as to get away with anything, but in practice they're just humans like everybody else, and will eventually make a mistake that takes them down.