Low-trust rules are symptoms of low-trust behavior, not causes. California tends to be early in introducing laws in general, but as far as I can tell, the entire country has been becoming more and more low-trust over the decades. It's worse in denser areas obviously, but you can see it in suburban areas and even sometimes in rural areas. I don't think it's pessimistic to say that much of the US, compared to other "developed" countries, has a problem with basic respect for strangers, neighbors, the local environment and infrastructure, public resources, businesses, etc etc etc.