directed by Simon Langton
This is a mid 80s British spy thriller that is carried by a powerful but understated performance by Michael Caine. It is a truism that until people experience something horrible they may lack the perspective to be empathetic to previous sufferers. People often accuse their political opponents of having this trait and of thereby being, well, sinful.
I think that this is a human trait, and not one that is by amazing coincidence only found among people you loathe.
There are many stories where the protagonist discovers that his own organization, corporation, group, people, or race, whose immorality he was happy to ignore or even profit from, has harmed or even killed the protagonist's loved one--someone in the in-group.