Mental health issues caused them to be homeless. People with severe Bipolar, borderline, or schizoeffective disorders can't function in society without being heavily medicated, and a choice was made to not take that medication (I don't blame them. Anitsychotics have super shitty side effects).
Sure, homelessness might make it worse, but their illness is what led to the homelessness.
No, the ones I posted show the demographics of the chronically homeless. People who aren't homeless have nothing to do with the discussion.