Well, people could become homeless outside of San Francisco (possibly after becoming addicted to drugs), and then migrate to San Francisco. Even in the hypothetical scenario where houses cost nothing but are unavailable in San Francisco, it would seem misleading to blame that SF housing shortage for the homelessness of someone who migrated there after becoming homeless.
Is there data available for how many people currently homeless in San Francisco became homeless in San Francisco? That is, where did they last rent property? I'm not being snarky; I'm curious what the percentages are like. My guess is that a significant majority of homeless people in San Francisco were previously renting in another location, then got evicted, and then eventually moved to SF.
> it's incredibly difficult to cope with mental illness or overcome addiction while homeless. It's also difficult to hold down a job.
Yes, that's true, once you're homeless. My question is about how the housing shortage in San Francisco causes homelessness. That is, how does housing policy in a jurisdiction lead to people becoming homeless after they were previously living in a property within that jurisdiction?
Also, consider what might make a city an appealing destination for someone who becomes homeless while addicted to drugs. If your heroin addiction gets you kicked out of your apartment in Reno, and you're looking to score some smack, why not catch a $15 Greyhound to San Francisco? It's an easy place to buy drugs, and it's a city well known for its citizens and authorities tolerating people openly using drugs and sleeping on the street. And when you run out of money, you can smash a few car windows until you find some cash, then walk a few blocks to exchange it for drugs from your nearest heroin dealer.