I don't recall if I saw that one, but over the recent past there have been a number of "strange" stories involving the homeless disappearing (old links, may not work):

Guardian.com: Mystery in Salt Lake City, Where Have the Homeless Gone - Following a police operation everyone seems puzzled by the whereabouts of hundreds of people who lived around a downtown shelter

YouTube: Where Have the Homeless Gone - Hundreds of videos detailing disappearances right across the Lower 48, witnesses speak of fire evacuees, abductions, FEMA, roundups, forced detention & killings

Is Denver "Disappearing" the Homeless?

Sudden disappearance of hundreds of homeless people from Salt Lake City

The Great Disappearance of 2009

Jane Tande @ YouTube, Evidence of the UN's Depopulation Agenda - A search of Thousand Oaks & Newbury Park in Ventura County, California reveals something nefarious is happening to the homeless ppl

This is just what I've collected very casually over time. Reeeeeeal creepy vibe when you put it all in a row like that, like the start of a horror movie. Joke's on us, though, we're living in it.