As a many-decades resident of Santa Cruz and San Francisco, and a as someone who has in the past been deeply involved in the street/drug scene and been associated with and friends with many dozens of people who have lived on the streets, I think this bizarre attempt at categorization missed the most visible and important group of people on the streets... People who choose to live on the streets. Go talk to people. As…
Do these people not fall under "the ruiners"?
The key difference is that people like this who are living on the streets intentionally, if they get kicked out of the area they're living in or if the friend group gets broken up, they'll just go back to living in regular housing. Things like housing centers aren't useful to this group, but if you have cops go through arresting people they will go away.
(For what it's worth, my source knowledge here is totally personal and anecdotal. When I was a new grad student at Berkeley I was surprised when a roommate of a friend told me he had recently spent a few days on the streets. He explained to me that he did this often, panhandling to make some extra money, thought it was generally fun, and met a number of people doing it for similar reasons.)