Check out this article:
Here’s a great quote:
"In contrast, in The Dark Knight, civilization is corrupt because human hearts are corrupt. Even those who are trying to cleanse Chicago—ahem, I mean Gotham—of organized crime are capable of doing dastardly deeds in pursuit of what they think is the good. While WALL-E’s biggest villain is a largely de-humanized corporation (Wal-Mart stand-in Buy n Large), The Dark Knight asks us to wrestle with our internal villains, our own desires for power and glory and revenge. “So where’s the hope in that?” you may ask. It’s only once we recognize our own sinful urges that we can be changed—and we can change society—for the better, in true humility. If evil is externalized in some institution, then we will continue blind to how we commit murder, adultery, etc., in our hearts. We’ll think we can separate ourselves from evil simply by refusing to support a certain institution. (And I’m not just talking about liberals boycotting Wal-Mart here—the Religious Right has done the same thing, just with different institutions.) True hope for change is grounded in admitting our own corruption, the impossibility of keeping ourselves entirely clean, and calling on Jesus to save and heal us."