What suggested origin? There's no hard evidence to say he's a gangster before he becomes the Joker, it's just what we're reading into the sides. They're very open to interpretation so far, IMO.
Well, the line in the script about bodies being dumped there fits nicely with the script treatment comments we heard earlier about the Joker being a body that was dumped there by the mob. But it's why I called it a
suggested origin. Nobody knows if it's absolutely true or not, but it seems to fit pretty well.
Nepenthes said:
I think TKJ makes a big difference by reinforcing what always existed. He makes more sense, if that's possible. Before he was a just a wild maniac but now there's logic to the insanity and more importantly, his relation to Batman.
The Joker has worked just as well when he hasn't had the TKJ origin, if you ask me. See BTAS, where that Joker is clearly nothing to do with THE KILLING JOKE, and has a gangster origin. But the Joker's just as phenomenal a villain as ever.
And the Paul Dini/Alex Ross origin in BATMAN: BLACK AND WHITE makes just as much sense as the one in THE KILLING JOKE. In fact, it's one of my favorite suggested origins. No-one talks about it much, though.
Nepenthes said:
Also a big part of the origin is that he doesn't talk about it. He doesn't carry it with him. It reshaped him and turned him out into the world as a monster who needn't rationalise his actions. TKJ's song and dance to Jim Gordon was the rare exception.
Well, that begs the question - why is it important? If it doesn't really inform the rest of the character that much, why do we need to know it?
Furthermore, nobody really *agrees* that it's the origin. Even among creators themselves. It's kind of accepted within DC continuity, but plenty of writers do everything they can to ignore THE KILLING JOKE, and unless a story brings it up, I never once think consider that it's in the character's history, and when I do, I don't think it enriches my experience with the character. Sometimes it takes away. Even THE KILLING JOKE had the good sense to not be conclusive (Joker's "multiple choice" comment undermines the entire backstory, beyond something tragic happening).
I've always taken THE KILLING JOKE as just another theory, and it's nice to have it as a suggestion, but I don't think it's necessary nor do I particularly want it in THE DARK KNIGHT. If they leave the door open to it in THE DARK KNIGHT so fanboys can read into it and see THE KILLING JOKE if they want to, fine, but I don't want any concrete connection to that origin made.