[The_Double]

The problem for san Francisco is that they just attract more homeless whenever they try to help them. You can not solve poverty in a single city with open borders, you need to solve it for the whole state/country. Especially if the city has a temperate climate that attracts homeless anyway.

As an aside: The big cities in the Netherlands also have some of the poorest neighborhoods in the country. If you pick a random smaller town/city it is likely to have less poverty than Amsterdam, (but also less wealthy residents).