AFAIK the individual researchers who get their work pirated and put on Sci-Hub don't seem to particularly mind.

Check out blog post critical of sci-hub and how it appeals to academic faculty:

By freeing published scholarship from the chains of toll access and copyright protection and making them freely available to all, it can feel like you are helping a Robin Hood figure rob from the rich and give to the poor.

It goes on to explain potential security issues, but it doesn't even try to attack the concept of freely providing academic papers to begin with.

I'm starting to think the term "piracy" is morally neutral. The act can be either positive or negative depending on the context. Unfortunately, the law does not seem to flow from morality, or even the consent of the supposed victims of this piracy.