Something I don't think has been discussed much on this or any other forum, at least not directly to my knowledge.
Quiet simply, there are versions where Batman finally meets the man who killed his parents (usually Joe Chill) and gets some closure from that event (usually in the form of Chill dying somehow). And there are versions where he either explicitly never learns the identity of his parent's killer, or it simply isn't brought up.
The question is - does this make a difference? Does finding his parent's murderer affect Batman's psyche and his character in any way? Does not knowing the truth change things?
When Chill was first removed from continuity around the time of Zero Hour, the argument made was that Batman no knowing his parents killer meant that on some level, his war on crime was truly never-ending...since every criminal he took on was a proxy for his parent's nameless and faceless killer.
This was official continuity all through the 90's and early 2000's...which coincidentially (or not) was the era of 'Batjerk' and the dark, manipulative Batman. Is there a connection? Is a version of Batman who never got closure over his parent's murder a more ruthless and disturbed figure than one who has?
Contrast this with the Nolanverse. Joe Chill is brought to justice the same night. Bruce wants to kill him when he's up for parole, but he's killed by one of Falcone's men. Bruce gets a lesson in how Chill was just a symptom of a larger corruption, and from that moment on, he's no longer on a mission to get revenge or closure for his parent's death, but on a mission to save Gotham. Indeed, Bale's Bruce Wayne is arguably one of the most well-adjusted versions of the character - he's also the one who seems least affected by his parent's deaths. Yes, his work as Batman is about carrying on his father's legacy in a way, but he doesn't really seem to be constantly haunted by their deaths the way many other versions are (in fact, I don't even think the Wayne murders are brought up much, if at all, in TDK and TDKR).
Do you'll think there is a connection? Is the path to a more well-adjusted and heroic Batman finding Joe Chill?