I don’t deny that at all. But people with, for instance, schizophrenia did not develop a serious mental illness because of living on the streets. Mental illness is certainly exacerbated by living on the streets, being unable to get treatment or other support. I agree with that 100%.
I also agree that being without stable housing, access to food, and community can make a person lose their grip on reality quickly; absolutely. But the cycle between being hospitalized for serious mental illness, being discharged without support, and living on the streets is a crucial issue.