Civil War is a paean to capitalism, to its resilience in war and its potential to forestall war by directing thrill-seekers towards the quintessentially pro-social activity of amassing wealth.
To most trapped within it, war has no logic. Those who shoot at you are bad. You try not to get shot, you keep doing your job. You live by your instincts.
By not laying out the "logic" of war, the movie succeeds at being immersive. Cinematography is excellent: deliberate, confident, beautiful.
The movie is about a calling. The calling is neither right nor wrong, neither beautiful nor ugly. Being true to one's calling, not squandering it, is all one should be.