Where did you get that 3 per 100k from? In each of the last 2 years there were 55 homicides in SF from what I can tell. Maybe you're thinking of New York, which is half of SF's rate?
https://sfist.com/2023/01/03/sf-sees-exact-same-number-of-ho... https://en.wikipedia.org/wiki/List_of_United_States_cities_b...