It's a concerning level of paranoia to suggest that multiple and separate data collection sources, including the city government, local police, state police, the FBI, justice advocates and local journalists, are ALL manipulating statistics to create a narrative that SF is safer than your perception. Especially considering that your personal narrative would be preferable to the police agencies, since it would allow them to more easily demand (and receive) more funding if violent crime were actually on the rise.
Please go read the threads about the Bob Lee suspect arrest, so you can see all of the people who were making the same mass-hysterical argument you're making, but admitting how they now regret getting caught up in that "SF is the Thunderdome" hysteria.