Because politicians keep calling for "More cops on the streets!"
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Yup, more cops write more tickets which means more income for the city. More cops means they can set up stings to catch johns and prostitues, which pay fines and leave jail. More cops means they can set up stings to catch drug dealers and keep the assets in the city.
More cops DO NOT mean more protection, that's for sure
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." -Manuel II Paleologus