alt Hacker NewsYes, crime decreases tend to stick.
Chicago started with similar conditions as NYC (30 murders per 100000 in 1991), but they didn't have no-nonsense mayors like Bloomberg and Rudy. So its murder rate now is still 5 times that of NYC.
Broken window policing and stop-and-frisk absolutely worked. Stop-and-frisk was found to be unconstitutional, but it also was highly effective.
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Chicago was run by Richard Daly 2 for 20 years during the Guliani era. I’m not sure what a no-nonsense mayor is but Daly resolved a dispute over an airport by having the runway jack hammered over night in the middle of negotiations.
During the 80s CPD ran a torture warehouse. They are currently operating under court direction for their mass use of pre textual traffic stops.
I’m not buying your “just so” story about mayors or hard nosed policing being the difference.
CPD generally does whatever NYPD does. The difference is that New York isn't Chicago. Different geography, different forces at work. Peter Moskos wrote a whole book about how NYPD turned things around in the 1990s, and "stop and frisk" and "broken windows", whatever Malcolm Gladwell wants you to believe, don't feature prominently in it.