Part of me feels that the publicity side of their argument is a little overblown. Many people do publicly disclose exploits, it's just that LulzSec has made a huge deal in the media about each one.
Another part of me is happy to see them call people out on their abysmal security practices. Sony would not have upgraded/redone their security practices had there not been attacks. The only thing worse than poor security is having a false assurance that it's good.