Just a quick Google implies that this is a complete fabrication
https://www.sfgate.com/crime/article/San-Francisco-crime-Che...
https://www.sanfranciscopolice.org/stay-safe/crime-data/crim...
https://www.sfchronicle.com/sf/article/san-francisco-crime-r...
>Ideology gets the best of people and they don't want to believe.
The irony of saying this with no data to back up your claim, and the data that exists showing the exact opposite of your claim, is truly palpable