It's kind of a fairy tale of the kind Disney sells you: if you do the right thing, everything works out for the best. We like that idea because simplicity is appealing, but the real world is complicated and conflicts with such nice notions.
In Disney movies when you do the right thing, it saves the world in the end.
In the real world when you do the right thing, sometimes all you achieve is nazis running over a crowd, and you end up with a crisis of conscience and not much to show for it.