Ideas that come to mind are (1) reclassifing crimes as not crimes - instant reduction in crime in stats but no reduction in actual crime and victims (2) less reporting because of less enforcement as in police don't enforce the laws either because they don't want to or because there are less of them so there is less reportihg (3) less reporting because of uselessness. if you don't believe the police will do anything why report it. Car gets broken into, reporting is a chore that produces no results, reporting to car insurance just raises your rates.

Etc... as just one example I recently rented a car at SFO and there were signs saying don't leave anything valuable in your trunk because of theft. that's effectively saying the government isn't working to prevent this crime so the criminals are winning so you can no longer use a car for one if it's intended purposes. In can fully imagine in 20 years we'll be told not to store any valuables in our houses. that not how it should work.

I lived in the mission in Sf. Crime is way worse today than 20 than ago, any stats that claim otherwise are lying