You could also do Apocalypse Now, Vietnam being a morally dubious war and extreme examples of and the twisting of morals. You'll probably find lots of material on it as well, as well as links to heart of darkness
In fact here's a few links I found just typing in 'apocalypse now morals' into google
http://traumwerk.stanford.edu:3455/trauma/92 "Apocalypse Now" by B. Ruby Rich
"Is it wrong for a man to love his guitar?"
"It is if he puts his balls between the strings, and strums himself to ecstasy!"