Well, I thought last night's documentary about 9/11 was depressing... try sitting through one on the collapse of Chinese elementary schools in an earthquake due to shoddy workmanship.
This is a really interesting and very well made document of the parent's march to the local government capital to complain that they were not responding to their requests for an investigation. It's very painful to watch the parents all dealing with the recent deaths of their children. By nature, most of them were only children, as the government heavily taxes families with multiple children.
The show is short at 38 minutes, but very strong nonetheless.