What Happened To SF Homelessness?

Last year, I wrote that it would be very hard to decrease the number of mentally ill homeless people in San Francisco. Commenters argued that no, it would be easy, just build more jails and mental hospitals.

A year later, San Francisco feels safer. Visible homelessness is way down. But there wasn't enough time to build many more jails or mental hospitals. So what happened? Were we all wrong?

Probably not. I only did a cursory investigation, and this is all low-confidence, but it looks like:

There was a big decrease in tent encampments...