There were similar findings in Regina about 8 years ago. About $18,000 spent housing someone with about $73,800 saved on average between hospital, ER, detox, and policing (2017 dollars). Here's another article on it from 2018.
The difference that a stable, safe, and secure place to live makes is quite obvious, it's sad this can't get more support everywhere.
I remember a time where I really hesitated to help someone, and I realized that feeling of the 80%. "It's not my problem. They'll be fine. Someone else will help. I have things to do." But what happens when we all think that?
It wasn't emergent, an elderly man had fallen and gotten a bit tangled up in a shopping cart. No injuries and just needed some time to catch his breath. That feeling while walking away, knowing you helped someone though...it's pretty special.