A couple of counterexamples. Moscow used to have plenty of homeless people (not sure how it is these days) despite harsh winters. New Zealand has very few, desp

A couple of counterexamples. Moscow used to have plenty of homeless people (not sure how it is these days) despite harsh winters. New Zealand has very few, despite similar weather conditions to SF. While it's probably true that SF has more homeless due to migration, I don't think it's the root cause. You really have to look at the societal structure, government support and so on for the causes.