Ra's al Ghul : Tomorrow the world will watch in horror as its greatest city destroys itself. The movement back to harmony will be unstoppable this time.
Bruce Wayne : You attacked Gotham before?
Ra's al Ghul : Of course. Over the ages, our weapons have grown more sophisticated. With Gotham, we tried a new one: Economics. But we underestimated certain of Gotham's citizens... such as your parents. Gunned down by one of the very people they were trying to help. Create enough hunger and everyone becomes a criminal. Their deaths galvanized the city into saving itself... and Gotham has limped on ever since. We are back to finish the job. And this time no misguided idealists will get in the way. Like your father, you lack the courage to do all that is necessary. If someone stands in the way of true justice... you simply walk up behind them and stab them in the heart.
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From: Batman Begins (2005)