> arresting people tends to work and alternatives tend to not

What I've read many times is that (essentially) the oppposite is widely accepted consensus: Arresting never works. The US tried the 'drug war' for decades and it was ineffective. Do you have evidence otherwise? It's also unjust to criminalize illness and medical problems for poor people (rich people get sympathy, rehab, and lots of second chances).

What does work is overdose prevention, including needle exhanges and safe injection sites, treating addition as the disease it is (which is how it's treated for rich people), and housing (people experiencing the great instability and stress of homelessness are much less likely to make other changes). Maybe some others I'm not thinking of, too.