And let's not forget all the cities in the US that send their homeless to CA, usually to SF or Berkeley, where the police and citizens are more tolerant than most places.

I befriended a homeless guy I saw every day walking to/from work. He never asked for money. I struck up a conversation, offered to buy him food and we talked for months, every few days (when I would sometimes buy him food). He had been a machinist in PA, got laid off, and got to N CA somehow. The weather made it easier to live outside, year round. I pushed him to get an ID, which is needed for pretty much anything, and he did. I haven't seen him in a couple of months, so I hope he got into a shelter.

So, the weather and tolerance is a big reason people come to CA when they are homeless or near homeless.