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It'sa meter that measure how much crime there is in an area and the amount of Batman requried to fight it.
Yes and no. Batman's territory was Gotham City, while Superman's territory was Metropolis. Sometimes, they teamed up to fight crime together.
None. He is just extremely smart and good at building devices that help him fight crime.
Batman & Robin
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Batman fights in his hometown of Gotham
The Dark Knight was driven to fight crime by witnessing the murder of his parents when he was a young child. Flying is just a by-product of his "persona".
Batman became a crime fighter due to the death of his parents at the hands of a robber. So Batman fights crime ... that's what he does.
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Revenge. Earlier in the character's history this was what many thought but Batman's goal is not revenge. His goal is to make sure no one else has to suffer what made him lose his childhood. Crime.
Batman's parents died in Crime Alley when a criminal shot them.