"Piracy" is a very nuanced subject, depending on what/who you are talking about.
I also have a book at a major publisher, with an outrageous price, and when I saw it "pirated" I only felt joy at the fact that more people will get to read it and thus my work is more meaningful. And I also downloaded it myself, because I actually didn't have it in PDF, only in physical form.
Since when have we asked authors permission to add their book to a library? In many places (including the US) if you publish a book it is mandatory to submit it to a library.
As far as I know, libraries in the US purchase their materials like anyone else. They have the right to lend due to the Doctrine of First Sale[1], because what they lend they legally own.
>In many places (including the US) if you publish a book it is mandatory to submit it to a library.
According to Wikipedia, in the US publishers are required to submit two copies of a published work to the Library of Congress[0], not to distribute copies to public libraries.
[0]https://en.wikipedia.org/wiki/Legal_deposit#United_States
[1]http://www.ala.org/advocacy/copyright/copyrightarticle/libra...
Not in the case we're talking about here. Sci-hub doesn't provide copies of novels. It provides copies of scientific research papers, for which we, the public, have already paid with our tax dollars. The payments to journals are not deals between those publishers and the scientists; they are deals between those publishers and the government, to get us to pay again for something we've already paid for.