“This is also the way Christian Bale sees Bruce Wayne and Batman. He told Entertainment Weekly: “I was playing the idea of there being three Bruce Waynes. The public, vacuous billionaire. The private Bruce Wayne who is still a child. And then the vengeful one who is a monster. Remembering that, I was no longer playing a guy who was dressing up and looking silly. It was a man playing multiple parts, and a man who dressed up as a monster for a reason, because he feels monstrous, and so he must become a monster in those moments.” And that’s why, as many have observed, it’s the “vacuous billionaire” who is the real mask.”
http://blogs.suntimes.com/scanners/2012/07/superheroes_good_vs_evil_isnt_.html