As it explains in the essay, there is a system called Infamy, which is so subtle that I didn't even notice it. It assesses your cruelty in the game and the people in the world behave accordingly. Apparently, at the extreme they even stop trading with you. As the quotations in the essay try to explain, the creators of Far Cry 2 explicitly evaded embedding a moral story or judgement in the game, but rather created dynamic conditions for the player to form moralistic narratives himself.