I want you to imagine a vengeful Batman killing Joe Chill in an act of rage and hatred, the version of Batman is obviously Bruce Wayne from the comic, if you want a really specific scenario, let's say that this is Batman as of Batman: Year Two because this nearly happened in that story, but the Reaper interferes, killing Chill before Batman. But for argument's sake, let's say the following happens:
1. The Reaper doesn't interfere and there is no other kind of outside interference.
2. Batman pulls the trigger on Chill.
What would the consequences be? What kind of effect would this have on Batman's psyche?