the theme that General Kurtz "went crazy" but in his own way he went "completely sane" - is this also in the book Heart of Darkness? The title suggests that it might be.
To elaborate on what I'm talking about: In the movie, Kurtz says that at some point he realized that to be the most effective military man, he had to give up all remorse and become ruthless. He hung bodies from trees to intimidate people and just gave up all human compassion and said, "Let the bomb exterminate them all." He was called "crazy" but he saw it as a logical extension of making war. Chilling.