As a retired librarian, I know that this is nothing new. What is new is the organized and vicious manner people use these days.
Before a crank might complain and we would bring out our intellectual freedom statements and policies. Let the rant go on a bit, then let the complainant know that as a public library we pride ourselves on the fact:
We have something to offend everyone and that is a mandate that we defend.
With people becoming more violent and unhinged, it is scary to be the holder of the knowledge and the force that protects intellectual freedom.