In San Diego, not far from the gates of the fantasy world of Disneyland, tent cities lining the freeways remind us of an ugly reality. Homeless individuals are slowing rail traffic between Sacramento and the Bay Area and swarming subway trains in Los Angeles in search of a place to sleep when they’re not languishing on Skid Row. Drug use among the homeless is plaguing communities, with discarded needles threatening children playing at public parks. And every day across California, thousand...