How To Reduce Crime Rates (Scientifically)?

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What makes an evil person evil? Desires and no-empathy (Emotions). There would be no reason for them to act, unless they have a desire, and if they have such a desire, they would kill themselves if they have had such large amounts of empathy.
unfortunately, data shows crime rates have increased, even when people are harsh on crime... is there a way to rehabiliate monsters? Is there way to prevent from such problems happening once again?
Basically, crime rates have been reduced, what can we do it make go down further?