I question that all the tent dwellers are mentally ill.
Doesn’t really matter though because they have created an American version of squatter slums thet the california mayors are afraid to attack in a civilized manner.
Stats are that 20-45% are, and require hospitalization/institutionalization w/ appropriate meds. On their own, they stop meds; that is why institutionalization is necessary.
https://www.bbrfoundation.org/blog/homelessness-and-mental-illness-challenge-our-society
Much more here: