Apocalypse Now1979

Lieutenant General Corman:
Well, you see Willard, in this war, things get confused out there: power, ideals, the old morality, practical military necessity. But out there with these natives, it must be a temptation to be god, because there's a conflict in every human heart, between the rational and the irrational, between good and evil, and good does not always triumph. Sometimes, the dark side overcomes what Lincoln called the better angels of our nature. Every man has got a breaking point. You and I have one. Walter Kurtz has reached his, and very obviously, he has gone insane.