San Francisco has intentionally avoided this wonderful, easy solution because the city is filled full of fake liberals and progressives.
[1] "In August 2007, the US Department of Housing and Urban Development reported that the number of chronically homeless individuals living on the streets or in shelters dropped by an unprecedented 30 percent, from 175,914 people in 2005 to 123,833 in 2007. This was credited in part to the "housing first" approach; Congress in 1999 directed that HUD spend 30% of its funding on the method."
https://en.wikipedia.org/wiki/Housing_First
https://endhomelessness.org/resource/housing-first/
[2] https://www.theatlantic.com/business/archive/2013/08/the-ast...
It's practically tautological that if you give homeless people homes, then the number of homeless people decreases ( unless there was a time limit on the house and the measurement was done long-term).
I wouldn’t believe it myself if I wouldn’t have seen it. The worst bunch of them are the homeless that don’t want to be helped, yet keep causing trouble with their undiagnosed psychological afflictions.
I would probably agree to some degree.
So you could say of course homelessness decreases if you give homes, but that's like saying of course feeding hungry people decreases if you give them food.
The question of effectiveness, at least from the housing first perspective, here is whether or not this can be done in a practical manner and whether this has bad side effects.
This does make it a little harder to rely on data from housing first advocates if you do not share their assumption.
That being said my impression is there is some data that suggests better outcomes in terms of decreased drug usage and better employment, although I think there are some people who dispute this.
So I think there's a settled consensus that giving people houses can be done in a practical way, the extent of the benefits outside of housing is less settled, although on-average positive.
I'm not an expert though.
Criminal justice reform could also be a good idea. Many places will reject a job application for a stupid mistake that someone made years ago, even if it has no bearing on the type of work they are in.