[sdskinsfan2001]

Boys need fathers. Absentee fathers are the number 1 cause of crime. That's the starting point for improving crime rates in just about any city, regardless of the which side of the political spectrum is running it.

Followed by poverty and mental health (these are the 2 that should be the hardest to fix imo).

And also releasing violent criminals well before they ever serve near a remotely acceptable jail time.