The reason that war is such a fascinating subject for writers is because it's a revealer. Put a bunch of people in an adrenaline-fuelled life-or-death situation and their fundamental behaviours are exposed the scrim is taken away and the motivations behind each personality come out to play.
Even in a gleefully negative comic there is optimism although it's slightly hidden: It comes out through a comic character's sheer tenacity. He keeps going and trying to find some sort of fulfillment regardless of his perpetual failure record. That's a form of hope a form of optimism. Really hokey I know but it's true.