Originally Posted by The Joker
Why do so many people mistake Batman's retirement being a result of Rachel's death? If Rachel dying was enough to make Batman throw in the towel then he wouldn't have gone after the Joker and stopped his rampage after she died.
The reason Batman was retired is because Harvey Dent's heroic image and legacy cleaned up Gotham's crime so well that Batman wasn't needed any more. Remember this key scene;
Gordon: "We were in this together and then you were gone"
Bruce: "The Batman wasn't needed an more. We won"
Gordon: "Based on a lie"
Rachel is the reason why Bruce gave up on trying to find himself some kind of normal life after he hung up the cape and cowl. Again two key scenes spell this out;
Bruce: "There's nothing out there for me"
Alfred: "And that's the problem. You hung up your cape and your cowl but you never went to find yourself life. To find someone"
Bruce: "Alfred, I did find someone"
Alfred: "I know, and you lost 'em. But that's all part of living"
Alfred: "You used to talk about finishing. About finding a life beyond that awful cave"
Bruce: "Alfred, Rachel died knowing we had decided to be together. I can't just move on. She didn't. She couldn't"
Alfred: "What if she had?"
Bruce: "She couldn't...I can't change that"
Alfred: "What if before she died she wrote a letter saying she chose Harvey Dent over you.....and what if to spare you pain I burned that letter"
Bruce: "How dare you use Rachel to try to stop me"
The movie makes it very clear, but so many people always say he quit being Batman because Rachel was dead.
It's not really all that hard to notice if one pays attention.