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Morals are a large part of what keeps people from eating one another, both figuratively and even literally under dire circumstances.

The statements made by Nolan's Joker were most likely culled/derived from the central theme of Alan Moore's Killing Joke in which the Joker explains his mental condition by having quite literally (from one memory even as he freely admits he is an unreliable witness to his own life story), the worst possible day he could ever have in which both his wife and unborn child are killed in a freak accident and he is strong armed into being the fall guy for a simple heist gone terribly wrong that he only agreed to participate in the first place to earn enough money from his cut to raise his child anywhere but the slum in which he and his wife were living. After the trauma of being in a shootout, being confronted by Batman for the first time (when he was just a simple failed comedian), and jumping into a chemical waste pool to escape what he thought God Himself had sent to punish him and finally his chemically induced skin bleaching/burning after almost drowning, he simply snapped.

His point was that one really bad day was all that any sane person was away from going completely batshit crazy as a defense mechanism.

The killing joke was that one crazy man, made insane by similar circumstances, was attempting to help another crazy man take a leap of faith on the road back to salvation.

It was less about morals and more about the glue that holds society together and allows people to function on a day to day basis despite all the unjust and often vile things that are both beyond our control and in other instances, are the direct result of our own actions.