No way San Francisco is 10.
They had 56 murders last year, while San Jose had only 35.
Same size cities and crime stats are wildly different in every category
Remember the fable about slow boiling a frog in a pot? The frog is content to stay as the temp slowly rises.
People in these cities were 100 times happier 50 years ago. Now they're content not being a murder victim. Happiness is not what it used to be.