It get's me that so many people are basically saying it serves these people right for using the service. I don't think that it matters that this is a "cheating" site, your privacy should still be guarded and it's not fair that all these people are being exposed. Secondly, I'd wager that many of the users sign up to use Ashley Madison for the thrill of the idea and probably aren't actually cheaters themselves or hooki…
1. It releases the data to everyone, not just to a cheater's partner. I'll buy that a cheater deserves to be outed to their partner, but to their boss? Their psycho ex? And that's not even thinking of the person who was cheated on: do you really think you would want everyone to know that your spouse was cheating on you?
2. Not all the users of the site are cheaters. Some are just role playing, some were just curious, some were probably trying to catch their partners cheating. Ashley Madison's database doesn't make any of these distinctions: everyone gets the scarlet letter.