The plural of anecdote is not data.
Like every other US city violent crime started to drop significantly after 1990. Nothing to do with who was running the city or what kind of regime the police were using. Violent crime fell no matter what the political/policing situation was. The reason being .................... lead having been removed from gasoline years earlier. The same thing is true the world over and because various regions of the world stopped putting lead in petrol at various times it's easy to check. Once a generation of kids grow up with reduced lead getting into their brains violent crime has dropped significantly. Bit of a spike the last year or so but probably down to the pandemic and associated stuff.