Ra's explains that the League plans to use a fear toxin invented by their partner Dr.
Jonathan Crane (alias the Scarecrow) to infect the city with mindless panic, and watch it destroy itself. He claims that the League of Shadows had attempted to use economics as a mean of destruction, which led indirectly to the murder of Bruce's parents when
Joe Chill attempted to mug them after losing his job, their deaths subsequently prompting the industries to band together and save the city. He explains that the destruction of Gotham City is merely another mission by the League to correct humanity's recurring fits of decadence and presumably protect the environment. Ra's then has his henchmen burn down Wayne Manor with the intent of killing Bruce, stating "Justice is balance, you burnt my home and left me for dead, consider us even."