Do you think every hacker announces everything they've hacked? We certainly haven't, and we're damn sure others are playing the silent game. Do you feel safe with your Facebook accounts, your Google Mail accounts, your Skype accounts? What makes you think a hacker isn't silently sitting inside all of these right now, sniping out individual people, or perhaps selling them off?
This is what you should be fearful of, not us releasing things publicly, but the fact that someone hasn't released something publicly.
This is the Internet, where we screw each other over for a jolt of satisfaction.
-- "Hacker" group LulzSec, from their 1000th tweet statement, 17 June 2011 (pastebin.com/HZtH523f); interestingly LulzSec apparently went out of business over the weekend