Again: "Acknowledging one problem isn't a proclamation that no other problems exist."
Are you saying that the human rights organizations shouldn't bring up problems unless they can list every single problem in every single industry? With your "logic", no one can complain or bring up issues, because they can't mention them all and there are always bigger problems. Better to just keep silent about them all, rather than protesting against some of them, right?
Not to mention that this particular protest is based on a report specifically about production of fishing nets, so it makes perfect sense that their complaint is specifically about that.
It's like commenting on a local news story about pot holes in the local street being a problem, by writing: "But what about the starving children in Africa? Why aren't you addressing that?"