In addition to the year-round mild climate, SF's local laws (and enforcement or lack thereof, e.g. legalizing theft of less than $1000 or intentionally spreadin

In addition to the year-round mild climate, SF's local laws (and enforcement or lack thereof, e.g. legalizing theft of less than $1000 or intentionally spreading HIV) attracts desperate people, as well as people who simply enjoy the lifestyle, from all over the US, by rewarding them for doing what they do. Basic "supply and demand" also applies to crime, playground needles and sidewalk turds: if you lower the "price" (punishment) at constant demand (people who want to steal or shoot up in public), the supply increases.