I'm sure there are plenty of Christian book stores / libraries out there who are unwilling to stock The God Delusion. And why would a LGBTQ bookstore sell LGBTQ hate propaganda?
I guess this could be taken to an extreme. Maybe a library in a highly conservative town chooses to not stock anything that has a hint of left-wing ideology, and maybe they have internet filters to block any left-wing web sites, and they only put front-and-center highly right-wing books.
I don't know, it's complicated.