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…
You're not seeing all the other homeless people though who were displaced by high housing prices and who aren't spending all their time drugged out in highly visible urban areas. There are many homeless people living out of cars or shelters, or in tents. Many of them even still have jobs, they just can't afford housing. See: http://www.latimes.com/business/la-fi-ucla-anderson-forecast...
/r/almosthomeless /r/homeless
even subs like /r/povertyfinance contain some people that live in their car at times.