It's probably a good sign for the movie that I'm having a hard time separating Movie!Bruce from Comics!Bruce, because the train of thought above was about to go into "and that's why Event X in Book Y has him so fucked up." before I realized that they're unmixy things.
Heh. Because Movie!Bruce (this movie) would never, not for a second, be able to resist taking home a boy whose parents died in front of him; and he wouldn't be able to stop himself from "firing" that boy when sidekicking got too dangerous (yeah, yeah, I know, retcon); and even though he had just fired his first sidekick b/c of danger, he *still* wouldn't be able to resist taking in yet another orphaned, damaged, angry boy.
Also, I love how they captured both the essential loneliness of Batman and how certain aspects of Bruce's personality were effectively arrested at age 8. His love for Rachel was a very non-sexual thing, a child's devotion to a playmate. I love my brooding repressed scary Bat god.
Seriously, the movie really *nailed* how utterly lonely Batman is, and has to be. (And I'm not sure why we're whitefonting that any more, but hey.)