In the film, Liam Nielson's character states something along the lines that they had tried to destroy Gotham once before via economic, but some stubborn citizens (Bruce's parents) kept things afloat. It seems like he aluded that he had a hand in their death, but doesnt out right state it.

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?