Here is where I really have to applaud Nolan’s writing. Goyer probably explained the Long Halloween to him and then Nolan took it to the extreme. The Long Halloween brings a Gangster element back to Batman, this we know. Harvey Dent’s slogan is a key to understanding just how much was added to the character though. “I believe in Harvey Dent” comes from the graphic novel and is an obvious homage to the opening lines in The Godfather. The lines explain how the American Justice system fails and gives away to corruption.
“I believe in America. America has made my fortune. And I raised my daughter in American fashion. I gave her freedom, but I taught her never to dishonor her family. She found a boyfriend. Not an Italian. She went to the movies with him. She stayed out late. I didn’t protest. Two months ago, he took her for a drive with another boyfriend. They made her drink whiskey. And then they tried to take advantage of her. She resisted. She kept her honor. So they beat her like an animal. . . . Then I said to my wife for justice we must go to Don Corleone.”
Heroes are symbols to people. It’s obvious that in Dent lies people’s faith of Gotham’s justice system. He is after all the first credible line of Justice the city has had in decades. However more is being said her for what Dent represents. Dent represents more than just America as well. Though he and Batman both could be related to the war on terror, and I know they have. What is being said is far bigger than that. Dent represents more than America. He represents human institutions, rules, law (human law to be specific), and order. So his fall is interesting as it shows that human duality between good and evil or order and chaos is inescapable. Communism or Capitalism doesn’t matter. The Joker, or Chaos, destroyed the best of them. Does this mean that all rules are meaningless? No, Batman knows that with knowledge that Dent has fallen people will lose faith in law and more people will die.