The population of the tent city in Santa Ana california was an unmitigated disaster for those who took the vouchers and residents. That did not work because the population of people living on the street in Southern California are doing it by choice (be it for the freedom to do drugs, mental illness or other defect). People who want help, generally don't get turned away in high income areas - every single church in the wealthiest areas, have a program and members willing to help those in need.