If you call out the cops to do a "welfare check" on that guy with a bad back and scruffy hair living in a van in the gym parking lot,
You are the problem.
Stop.
Anything he is facing only gets worse when he can't have a few weeks to get his shit together without being forced to move or worse, interact with the apparatus of oppression.
If someone is living in a van, they know that parking lot is not legally safe to park on for more than a day.
They know you neighbours in your fancy SUVs and gated community houses don't feel comfortable with the evidence of poverty so close by.
If they had a better option, they'd already be there.
The cops are never a better option.