I'm torn between agreeing with you, and thinking that Sony is more like an annoying asshole who went into a bar, picked a fight, and ended up starting a bar brawl. Sony has been treating their customers poorly for years. They installed rootkits on people's PCs via audio CD, and their customer support for their computers was so bad it made my sister cry, among other things.
This isn't about Sony making themselves an attractive target, this was Sony being flagrantly rude to their customers. Sony has basically been taunting the public for years, and a group finally punched them in the face for it. That doesn't make the punch right, but Sony should have seen it coming.