When I was a young man, my professor at university said advice is corrupting, don't ever be trusting. Don't show your emotion. Human suffering is an ocean and it's dark at the bottom of the sea.
Madness string 93230
She says 'You don't know what brings a person to a book', and it's taken very seriously, almost like a priest or a doctor. A librarian would also likely die by torture before they'd divulge someone's reading history.