simplest terms.......
the author of the movie generally shows the dark side/non hollywood-glorified side. usually the anti-hero is a loner turned from a free thinker into a killing machine ala Pvt. Pyle in Full Metal Jacket.
- Appocolypse Now
Platoon
Alls Quiet on the Eastern Front
Kelly's Heros
among others are examples of antiwar (yes, i hate putting Kelly's on there but it's stance of War=Greed kinda forced the hand)