Nothing seems complicated if you wave away all the details. You made quite a leap even in the first link of the chain ("wealth inequality => poverty"). I don't see how poverty follows from wealth inequality. That there are people who earn more or have amassed more wealth than me, sometimes fantastically so, doesn't make me any poorer. In fact, often times my own life is enriched by the value created by those who ended up becoming wealthy. Of course, this is not to suggest that every rich person created value for others to get there, or that people who create value for others necessarily become rich.

The link between poverty and homelessness, as discussed elsewhere in the thread, is mostly due to policy choices local to SF and California as a whole that greatly disincentivize building more homes to keep up with demand. I come from a country where (with some exaggeration) it feels like an urban park might have higher population density than San Francisco. There's no reason why one of the most desired markets in the world should be that way, other than through artificially restricting the supply.

> Countries that have affordable housing and jobs don't have this problem.

Very few countries, whether housing is cheap or expensive and whether jobs pay well or poorly, have this problem of people strung about, high in public, engaging in antisocial behavior. Most countries don't turn a blind eye towards drug addiction from a personal liberty standpoint, which I think is quite a uniquely American concept. Most will imprison people for possessing or consuming any and punish with death those who traffic. There is broad cultural acceptance of behaving in this way.