The Joker constantly shows a disregard for right and wrong throughout the movie. He steals, kills, and breaks many laws. For example the scene where the Joker is walking through the hospital after he has threatened to blow it up. As he is walking to the hospital parking lot he explodes the last of the bombs, utterly destroying the hospital. Blowing up a place where people are sick and dying shows a complete disregard for whats right.
The Joker uses charm to manipulate others when he uses his words and tricks to get the criminals to trust him and follow his plan during there secret meeting. It is at the part where the various criminals are sitting around talking to Lau on the television. The Joker comes in using his charms of killing and lies. He implants thoughts of distrust in the criminals leading them to end up following him.
The Joker exhibits aggressive and violent behavior at the end when he attatches bombs to two boats: one filled with innocent people and one filled with criminals. He then gives them the choice to blow one up. The Joker shows how violent and horrible he is in this scene where he jeopardizes innocent people.