"Dumping ground" implies other places did this to CA, which isn't substantiated by the article. As it says, the vast majority of CA homeless are from within the state. In the cities of CA, as in other rich cities, homelessness and high housing prices come from the same problem: prohibitive regulations on housing construction.
there are many other high cost cities in the world and yet only american liberal ones are in a state of decay and allow homelessness and crime
If not, feel free to ignore the rest of this. If so, maybe you can elaborate on what you mean. Are there non-liberal high-cost cities in the US in a better state? Furthermore, it's worth noting that the other high-cost cities worldwide almost universally seem to have more left-leaning (or US liberal) policies on most issues than most high-cost cities in the US. I'm not sure I see the connection between the political alignment and the state of decay, homelessness, and crime in high-cost cities.