-- Albert Einstein
In a later comment you ask ...how should I provide help & compassion?
I would say one-on-one as an individual walking the streets, you probably shouldn't, especially if you have children in tow.
We need to address our nationwide affordable housing crisis. California is disproportionately impacted and takes a lot of the blame for it, but I think they are basically the dumping ground and whipping boy for a national failure.
Decriminalization is helpful in part because if you criminalize use of the drug, it makes it harder to seek treatment. People who expect to go to jail for trying to get the help they need are more likely to not come forward and to continue to try to fix their problems themselves.
We need a better understanding of why people do drugs, what the underlying root causes are. It's hard to solve a problem without knowing why it exists. Given our long track record of not getting results, I think we have room for improvement in how we frame this problem.