Destroy all computers and go on a crazy witchhunt?
Hackers arent all bad. Yes... They have bad intensions usualy, but actualy alot of progress has come from that. You cant see everywhere at once, if the first hackers started coming along now, there would be huge amounts of trouble.
Norton wasnt a notoriously "good" antivirus. I wouldent be suprised if this wasnt the first time this has been done. Hopefully companies dont take a page out of nortons book...