I don't think I'm saying the court doesn't have the power to tell ISPs which sites to block, I'm just saying it's told them to block sites which don't impede copyrights because they've been duped by a big organisation.
I doubt they were duped. A single look at torrentz and all the other indexing sites tells you all you need to know about their intended purpose.
They exist to link to places distributing copyrighted works. I'm not defending the MPAA/RIAA here, but really, none of these sites are innocent.
Google's sole function isn't to link to infringing sites. If it was, Google would be blocked too.