The degree of under reporting can and does change through time. If you have a pro crime pro criminal DA like Chesa Boudin people respond to that. People report

The degree of under reporting can and does change through time. If you have a pro crime pro criminal DA like Chesa Boudin people respond to that. People report less crimes if they know nothing will be done. If they know stopping crime isn't a priority police are less likley to do anything to stop it. People respond to incentives. Incentives vary over time.