they technically are in the right for enforcing their rights.
I don't think that has been established. First of all, most of what goes on in the exJW world, and especially here on JWN, definitely falls under "fair use", as it is very serious criticism (and often parody) of the WT society. I'm thinking especially of Quotes case - this was not established law, this was just them bullying him because they have far more money than he does. His site was perfectly legitimate (under US law, anyway).
Laws have purpose, and copyright law was not established to protect secretive organizations. Of course they are going to try to use the law to their advantage, but that doesn't mean they are "in the right".
But also, and someone can correct me if I'm wrong, but this idea of linking to a site that host the "Flock" book is much like WikiLeaks - and I don't think even the extremely powerful forces that are trying to shut them down are doing so by claiming copyright infringement, are they?