That is bad use of statistics. San Francisco forms the core of an urban conurbation of over eight million people.

Sure, but SFPD covers only the County of San Francisco which had a population of 827,526 in 2024.

It's certainly not a perfect comparison by any means - but that's more to do with the very different urban/rural splits, forms and structures of inequality, histories of segregation and political violence etc.

If you can suggest another American police department which would make for a better comparison, I'd be interested in seeing the stats... but I strongly suspect that they'd show a very similar contrast.