This isn’t popular, but I’d challenge anyone who thinks homelessness in Seattle isn’t primarily an addiction and mental illness problem to go spend a few afternoons in areas with significant homeless populations (3rd Ave in Pioneer Square is a great place, if you need a suggestion). It’s not that affordable housing isn’t a problem in Seattle. I know people who couldn’t live on their own in Seattle anymore due to rent…
How do you know people don't become mentally ill or homeless after losing their home and their life spiralling out of control? Or perhaps that if you have a support structure you can manage mental illness? If you don't have money or friends, what group housing would you find? Why would you move to a different city, away from everyone you know, if you don't have a job to pay bills?
Because a substantial portion already have a history of mental problems before they became homeless, and typically they find themselves homeless because they reach adulthood and thus their primary caretaker either can't or won't be able to keep them off the streets. I personally know a couple of homeless individials that suffered from schizophrenia who found thenselves on the streets after their patents passed away.