I wonder how much of the drop is due to reduced reporting of crime? If the cops don’t show up to take a report, the crime doesn’t show up in the stats.
A friend of mine lives in the Oakland Hills. Her house was burglarized and the cops refused to even show up to take a report. No report, no crime, better crime statistics.
Just a wild hunch, but I'd bet things like murder, rape, and armed robbery pretty much get reported.