A quote from General Corman in Apocalypse Now:
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 a breaking point. You and I have. Walt Kurtz has reached his. And very obviously, he has gone insane.
That quote refers to a man reaching his mental breaking point. I've reached a different breaking point: my heart is broken.
You can't die of a broken heart. (Or so they say.) Psalm 147 says: "He heals the brokenhearted and binds up their wounds."
So it would seem, there is hope.
Regarding the film (which I've seen several times over the years), I've never considered what it was that supposedly made Kurtz go crazy .. until now.
I mean, they paint him (played by Marlon Brando) as a stud, both mentally and physically. But if you watch the film, I think you'll agree the thing that made him snap was .. being subject to a dysfunctional system.