No, that is just becoming vigilantes and still breaking the law. If they want to actually help, then they can go sign up for their local police department's cyber crime division and do the same thing within legal boundaries and proper oversight without breaking the law and actually being accountable for their actions. And let's not forget the "well they do more good than harm". A doctor who takes apart a single living person in order to harvest his organs to save the lives of tens or dozens of others is also "doing more good than harm". They [Anonymous] have caused disruptions and loss of livelihood to countless numbers of people; because once in a while they might do something that is according to you is fine does not exempt them from their actions.