Sometimes outside influences or knowledge of a story or author greatly influence our take on the story itself.
That may be the same reason I have no interest in seeing any movies starring Tom Cruise. Outside information has tainted my view of his portrayed characters.
I do like the sad books. The ones that don't seem sad, that is (and there IS a difference).
Sad books that don't seem sad
(you know you should be sad, but are enjoying yourself too much):
The Bell Jar -Plath
The Diary of Anne Frank -Frank
White Oleander -Fisch
Angela's Ashes -McCourt
The Glass Castle -Walls
Cold Mountain -Frazier