I suggest you read Batman: The Long Halloween. In it you'll see that crime in Gotham city is not caused by poor or disenfranchised people, but mostly by very powerful and very wealthy mob bosses who only want more power and more wealth. Also in several episodes of Batman The Animated Series such as "Double Talk" you see that Bruce Wayne does provide jobs and housing for reformed criminals, and takes an interest in keeping them on the straight and narrow.
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