Not arguing, Chris, just clarifying since my previous comment may have been misunderstood. I think that we are in basic agreement.

During the war there was a huge refugee area near Danang like that. Americans called it Dog Patch. Since places like that have some semblance of permanence (for better or worse) they can construct those shanties. Years ago, in Japan, I saw a trash and litter free homeless encampment under an overhead that consisted colorfully decorated cardboard. I was told that they were allowed to stay because they created no public nuisance.

After typing this I'll go out for my morning walk around the park where there are homeless encampments. Impermanence since they periodically get dispersed by the police. No doors, no walls, no roof. To their credit they use the public restrooms rather than crap on the sidewalks like in San Fransisco. They often discard clothing when it gets filthy. We gave a big bag of my wife's old clothes to a young homeless woman about a month ago. While I consider the crime, they bring to the neighborhood to be a nuisance we've managed to hold onto some compassion.