In the film, Liam Nielson's character states something along the lines that they had tried to destroy Gotham once before via economics, but some stubborn citizens (Bruce's parents) kept things afloat. It seems like he alluded that he had a hand in their death, but doesn't state it outright.

So, are we to make the conclusion that the murder of Bruce's parents was actually planned, and not just an accident? Was Ra's al Ghul a part of the plan, or at least the League of Shadows?