Pix brings up some very interesting points.
Way back when I was doing outreach programs for homeless and more specifically the homeless kids (kids around your age, Lilitu) it was shocking how many managed to "survive" day to day and what they did in order to 'survive'.
One would think that it was 1880's Victorian England and a chapter taken right of of Oliver Twist instead of a century later.
I saw things like something on the order of a dozen teens (15-19) all living in a flea bag hotel room. Kids living in cardboard boxes between/behind dumpsters. I knew two teens who lived in the trees of Golden Gate Park, they made their own hammocks and strung those between branches in the trees by the 'woodland' area on the west side of the park where at night they could do 'favors' for those men walking around in the park at night (for a small price of course).
I don't know about the land of Oz, but here in the US we have a fairly large chunk of the population who slipped between the cracks into poverty and despair. No one likes to talk about it, but we had and still have kids 14-18 (legal minors) living on and in the streets turning tricks in order to come up with money for food. Some of those kids are drug dealers, many of which are their own very best customer (meaning they use the drugs).
There were too many times where we (Brothers from the Friary, myself and a few others) would go out and check on 'our kids' to find that one was missing, only to discover that they had become yet one more 'crime statistic' - beaten, murdered, over-dose, or just got too sick and was too terrified to go to hospital out of fear that s/he would be sent back to their home which for many of these kids was a terrible/abusive situation.
During the 1970's and early 1980's many of the mental health hospitals closed their doors. The mentally ill were basically put on the side of the street to be collected by trash collectors. Thing is no one informed the trash collectors. Through the decades it has become fairly popular to dump ones emotionally/mentally ill on the street.
In L.A., sick people are treated minimally at the county hospital and after a very short period of time the hospital drives them to the nearby homeless shelter where the patient is dropped off on the street, more often than not in hospital gown and slippers and left to fend for themselves. Sometimes the staff doesn't even bother to place the patient at a homeless shelter.
http://en.wikipedia.org/wiki/Homeless_dumping
While you think people living in cages are bad, I have seen worse. Much worse.