Answer:They are both two sides of the same coin - two individuals who, because of a horrible day in their lives, became insane and decided to take on the world and make it in their image.
Explanation: Batman and Joker are fighting an ideological battle for each other's soul. They are both two sides of the same coin - two individuals who, because of a horrible day in their lives, became insane and decided to take on the world and make it in their image.