Re: Not what I have read..
Because it is not the place of Sony to be policing the distribution of stolen goods. They have to rely on the police like everyone else. Anything else is vigilantism and that is flat out illegal pretty much everywhere but the USA. Even there, most jurisdictions would call it interference with the law.
Sony doesn't get to play by a different set of rules than regular citizens. Either digital vigilantism is legal, or it's not. If it's not illegal, you can't go after Anonymous any more than you can go after Sony.
Pick a side, and live by the law. Even when you find that law inconvenient.