I agree with you and the GP.
I equate this situation to civil unrest. For civil 'direct action' to work, someone has to be inconvenienced. Hopefully, that 'someone' is the government, and hopefully only them, and hopefully they're inconvenienced a great deal. However, in reality, the government is just a bunch of people with lives and jobs, and they use the services of non-government people. So no matter how targeted some civil action might be, it's going to end up inconveniencing some 'ordinary' people.
The question is are the 'ordinary' people responsible for the government's actions? You might argue 'no', but you'll find a lot of people arguing 'yes' - ultimately, it's the 'ordinary' people that give the government the power to do whatever the unrest is about. We can argue about the indirect nature of that power provision, but no matter how corrupt or misdirected, the fact remains that it exists. It's the game we've chosen to play; don't argue about the rules.
And so back to Sony Pictures. Whatever the beef is with them, they were able to do that thing because of the people that work for them. You can argue that if those people didn't work for them that a whole load of other people would just take their place, but if the majority of people thought about who their employer was and what they do day-in, day-out, the shit kickers of the world would have a much harder time hiring good, honest decent and talented people. That might make them think twice about their business practices (or in the case of the NSA/GCHQ etc, their purpose in life).
[Anecdote: one of my previous employers used to get extra discounts on hotel rates because it was well known that the staff were nice people - sort of the reverse of what I'm trying to describe above]
Don't misunderstand me - if my employer got screwed over this badly, I'd be screaming innocence and "I'm just a brick in the wall, I'm not responsible" and so on (after all, I'm "just" a lowly techie, right?). But the fact remains that my work for my employer potentially facilitates someone else here to do bad things more easily. For what it's worth, I do have a moral compass, and so don't work for some of the worse companies out there (despite recruiters trying to get me into them), and I haven't seen my employer doing bad things. Other people may view their actions differently though, and perhaps they'd judge me differently as a result.