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This theory is wrong and it is easy to see why. Rates of homelessness are not correlated with "life choices" or "events" at all. Mental illness rates don't vary much geographically and they don't correlate with homelessness. Same with drug abuse and disease. However housing costs are very strongly correlated with homelessness. Great book on the subject: https://homelessnesshousingproblem.com/ Edit: prospective reply…
It's not wrong, though. This is just a rephrasing of the same problem. Imagine two people, one with a family that will take them in in an emergency and another with nobody. They both become heroin addicts. The addiction results in a job loss and a few arrests. Soon they've sold all their possessions, their health is declining, and they're behind on rent. Person A puts their tail between their legs and goes and sleeps…
There are people homeless in the US right now because of medical debt due to illness, is that their fault too?