There are clearly unwritten rules around this issue. For example San Diego has homeless encampments everywhere and Coronado has none. And while being an island

There are clearly unwritten rules around this issue. For example San Diego has homeless encampments everywhere and Coronado has none. And while being an island doesn’t hurt, Coronado also vigorously enforces its vagrancy laws, mainly by dumping them back in San Diego. Half the island being federal property probably has something to do with it maybe? Incidentally Coronado is one of the safest, cleanest, most beautiful, and expensive communities in the USA.