This is because there are few things nicer than a cool library when it is hot and bright outside. I like to go to a library and lean my head on the metal shelves when it is very hot outside. Libraries aren't too nice on a hot day because then too many people will come. Librarians are Mothers. Books are children.
Librarians love their books.
They take care of them. Literary critics will say a book is bad or good, but that doesn't matter to a librarian. All books are equal in the sight of a librarian. A book of this kind is often loved even more. Its dust jacket is repaired more often, it spends time in the office more than the other books, it spends less time on the shelf where strangers might damage it.