If you ask me, I'd say the person(s) responsible for the attack could be the persons selling the solution.... But that's paranoid right? So far as Japan's moves against piracy go, doubt it's that. Side-note: Japan should quit whining about piracy because if it wasn't for fansubbers, anime would still be practically unheard of in the west. You could probably count on one or two hands the anime series that were dubbed and licensed out here before the fansubbing scene.
But yeah, this attack's really annoying. It's screwing it up for everyone and I don't see the point/motivation. Like wtf did/COULD this community do to piss anyone off? Unless some 12 year olds discovered a how-to guide and picked a random target and now they can sit around circle-jerking about how they are t3h 1337 h4xxors, haar, haar.