Many jurisdictions face the same problem, as Seattle.
It is now universally recognized the problem is addiction, mental illness (brought about by the drugs, to a significant degree).
The jurisdictions must provide treatment/living facilities, at taxpayer expense.
But more significantly they must find the political will to exercize involuntary confinement. That is not easily reached.
Lawyers from "civil liberty" orientations argue in favor of having these thieves wander the streets, parks, beaches.
The local PD officers won't risk their careers and pensions, to please citizens.
California's stupid voters, enacted several measures, which just enable the homeless, keeping them on the streets, not in prison.
Honest experts readily admit there are adequate treatment options, but absent the will for involuntary confinement, they wander, defacate, etc.
See Dr. Drew Pinsky.