Please, excuse my language, but are you f***ing retarded?! You've got about the same chances of getting away with this as if you had just attacked the US Treasury building. Maybe they're taking measures to prevent it (for their sake, they'd better be), but do you really think you're so great that they can't track you down sooner or later? Why don't you just go stab a prison guard and save yourself the trouble?
On a rather unrelated note, I'm waiting for the day to come when hackers finally break into a way to modify a system's BIOS. So many computers will be overvolted, and god knows what else, to death when that day arrives...