Housing first can work

See Housing First Can Work If Done Right (worth reading the entire thing)

Excerpt: 

"Despite enjoying decades of bipartisan support, Housing First programs have become a target in the culture wars. Housing First provides housing and wraparound services that are not predicated on sobriety or psychiatric treatment. Conservative critics challenge this approach, arguing instead that people should be required to work and participate in abstinence-based addiction treatment or faith-based programs to be eligible for housing.

"These opponents of Housing First begin from the flawed premise that human pathology is the root of homelessness. By contrast, research clearly shows that housing shortages, wage inequality, and high rents—not mental illness, substance use, or even poverty—are its real causes. These structural factors explain why homelessness is more common in Seattle and San Francisco than in Detroit or Oklahoma City, where there is still plenty of addiction and mental illness, but where people with these conditions spend their time indoors."

Good public policy related to homelessness, is not necessarily cheap, but it's cheaper than building bigger jails. (from the above link) "It is true that by keeping people in homes and out of emergency rooms and jails, Housing First programs can reduce costs in overall municipal expenditures. Yet many of those who experience homelessness do not cycle through ERs or have costly health issues. Housing this part of the population might be the right thing to do, but it won’t necessarily save money.

"Cost is also tied to city-level housing markets and regulations. Houston has worked miracles with Housing First, but Los Angeles has floundered. The difference lies in the fact that Houston has abundant housing supply and few restrictive zoning laws. In Los Angeles, efforts to build new units have been thwarted by NIMBYism, high costs, and the uncertainty that surrounds all construction projects in California. To make progress in addressing homelessness where housing is in short supply and construction delays are inevitable, we need to invest in short-term shelter options while taking steps to expand the housing supply in the long run."

Also see:the previous post, Even Good Public Policy Struggles with Sabotage