According to Wikipedia, the main theme of The Dark Knight is escalation, such that each event lead to an escalation that results from the choices Batman and James Gordon make. A separate source said that if one were to start from the beginning the movie can be seen as sequence of small games with the first being the robbery scene.
The robbery scene being compared to that of the Pirate Game.
Is it possible that the primary theme is actually Game Theory? Since the actual escalation didn't occur until the end with the prisoner's dilemma and Harvey kidnapping Gordon's family? What is the main theme of The Dark Knight?