The fact that some markets, including Wall Street's, recovered quickly suggests that the fall was based on short-lived copy-cat behaviour by traders worried by steep share-price drops in Hong Kong, rather than by important new information about the value of American shares.
Giving them a place to stay isn't dealing with the kind of underlying issue, which is there's a very small number of people who are addicted to drugs, are mentally ill, have severe problems with alcohol, and they live on the streets and every winter they fall down drunk four times and get taken to the hospital and have to get a cat scan.