In Germany we have about 50k people living on the streets. Technically none of those people need to be. They could all get the necessary financial aid.
"In 2019, 36% percent of the chronically homeless suffered from a chronic substance abuse problem, a severe mental illness, or both"
The key word here is "chronic." According to the National Alliance to End Homelessnes[0][1] (based on data, including the link you cited, from HUD[2]), less than 20% of homeless people are chronically homeless. As such, less than 10% of the total homeless population "suffer chronic substance abuse problem, a severe mental illness, or both"
So you're projecting the traits of a (relatively) small group onto the larger whole. An assertion which seems problematic at best.
[0] https://endhomelessness.org/homelessness-in-america/homeless...
[1] https://public.tableau.com/static/images/20/2020SOH_PIT_bars...
[2] https://www.hudexchange.info/programs/coc/coc-homeless-popul...
"In 2019, 36% percent of the chronically homeless suffered from a chronic substance abuse problem, a severe mental illness, or both" [1] For the published data used to come to this conclusion see [2].
This doesn't include less sever mental illness which almost certainly contributes.
[1] https://sunrisehouse.com/addiction-demographics/homeless-pop...
[2] https://files.hudexchange.info/reports/published/CoC_PopSub_...