Perhaps because people don't deserve to be punished by crackers? It's not guaranteed all users on there are harming society. It's not like it's, I dunno, Oracle getting internal documents leaked. Or Sony (and despite how bad Sony may be, some folks were rightfully concerned for the damage to innocent employees). Or BP or the USG.

Overall I find it rather funny, and I gotta wonder who the hell would use such a site with their real name and billing info. Though I'm not under any delusion that it's fair, or that it's justice, except against the company itself.