This sounds like a convenient anti-police narrative to me.
I've never worked with homeless directly but I have several friends who have and one who still does.
There's probably no broad demographic in society that is more efficient at destroying their own amenities.
Granted, that's usually addicts.
And I know not all homeless are addicts, not all addicts are homeless, but it is undeniable that there is large overlap between the two groups
Anyways, my point is that blaming the police for destroying the amenities feels very fishy to me.