"Scapegoating" is evidently a well known though rare phenomenon. When I was working in Houston, there was a case of a family that kept one child essentially locked in the bathroom, chained to the wall, eating off the floor. Meanwhile, the parents were gainfully employed and had two other kids who were not mistreated at all. Think of those parents sharing pop corn with their kids in front of the TV while their brother is living like an animal in the same apartment. The boy somehow managed to escape (he was 13/14) and when Houston cops spotted him, they thought he was a little girl, because he was so badly undersized with hair down to his butt.
This case seems to be so much worse, with the "exercises" and feces eating and all the rest. How on earth could anybody go to bed, with that dear little girl padlocked in a footlocker, in July, in Phoenix? A painless lethal injection is way too good for them. And don't even talk to me about them being "insane." "Get on the d*mn gurney!"