Cosmically, Batman should not kill the Joker. As a symbol, the Joker taunts and belittles Batman's
principles. The smiling face laughs at Batman's attempt to rid the world of Evil. Ironically, it is a
logical response to Batman's madness, a reflection, if you will, of his own arrogance.
Batman tells the universe that his purpose in life is to rid it of one of its elemental forces; chaos.
In answer to that, the universe laughs at Batman in the visage of, you guessed it,
the Joker! For Batman to kill the Joker would mean that Batman has failed at doing what he swore
to do, which is to vanquish the evil that resides in the world, and in himself.
Batman is the symbol of human perfection, which is close to god. To kill the Joker would be this
symbol overreaching its purpose and becoming inhuman. The Batman would lose the human
aspect of his persona and become less than a man, an animal, in this case, the bat, which preys
at night and cannot see the light. (Man, this is deep) Batman has to remind himself, always, that
he is a human, and to kill another human is an inhuman act. Just because he battles with
demons on their turf does not mean that he is one of them .
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