It's not innate to cities...but SF's got some cleanliness problems that other cities in the country don't.

>This is not a problem innate to cities, and it’s not even endemic within cities that have these problems.

Density still matters though. You can go your whole life in the middle of nowhere without seeing someone take a dump in a public place or see a car that's been broken into.

Not really. The places where people are most likely to defecate in the street are places without toilet infrastructure, which in a global context, is much more a property of undeveloped rural areas than it is of dense cities.

The problem in cities is usually that some people aren't allowed to use any of the many toilets that exist, which is a much easier problem to fix.