I assume the comment you replied to meant the policies that led to the high crime rate. Which, I know many people who fear people leaving big cities to keep voting for the policies that lead to why they left the city in the first place.
Look at a graph of murder rates for LA vs NYC and their surprisingly similar even with very different politics. https://www.nytimes.com/interactive/2016/05/18/us/chicago-mu...
Chicago, NYC, LA, and many other US cities all had similar trends over similar time periods which line up with national trends. https://www.macrotrends.net/countries/USA/united-states/murd...
“Broken Windows” policing was a radically different paradigm that initially got a great deal of praise because it seemed to be working.