Originally Posted by RustyCage
I feel his quitting was multi-faceted, personally. It's not just one reason. There's obviously a lot of weight on his mind.
It's not just Rachel, it's not just his not being needed. It's both of those, and more. He became an outcast. He had to have felt horrible about Harvey. The Joker essentially won, and I'm sure that was eating up at him privately.
Agreed to a degree. The Joker didn't won, but that doesn't mean that the Batman triumphed either. The sacrifice Bruce made prevented the Joker from winning. People didn't lose hope, the criminals weren't set loose. He actually won. But Batman paid the price and had consequences.