It's honestly shocking that the US has absurdly wealthy churches and we have greater than zero homeless people on the streets. Helping the poor is the core tenet of the christian faith. If they practiced what they preach, it should be impossible to lay down on the street for more than five minutes and not be swarmed with offers for help.
* Housing is dangerous/scary (robbery, rape, physical violence, etc...)
* Housing is a conspiracy (to control people or other irrational ideas)
* The rules of housing are too restricting. (can't have a pet, visitors, noise rules, cleanliness rules, curfew rules, behavior rules, etc...)
There are others as well, but can't recall immediately.
A church can't fix these problems, no matter how rich.
While some churches do physical charity, that’s not the nominal function of a church in the general sense (it may implicitly be part of why churches are legally treated as charities in the US, getting not merely tax exemption but deductibility of donations for donors, but that is more an indictment of that policy than anything else.)