Joker tells Dent about "Schemers" which are the true evil as they lay out the plans for society especially when human life is expendable. He makes his point by saying that society does not panic when the expected people get killed such as a gangbanger or soldiers. Thus Joker has turned Dent against the schemers who viewed his and Rachel's lives as expendable, namely Gordon for choosing to work with corrupt cops, the corrupt cops in Gordon's unit who kidnapped them, and Mob boss Maroni who hired the Joker and Joker advises Dent to break away from the legal justice system that failed him and instead turn to chaos which is the only fair justice in society.
