In reply to Offwidth:
My heart/mind goes out to the moderators, I accidentally came across footage of a woman being stoned in Iraq, you could only see the crowd, and blokes carrying boulders into their midst and then a trial of blood from where her head presumably was, but it stuck with me for a long time, and had it's effect on how I viewed human nature and societies for quite a while. That was only one thing, too, they must see so many things during the course of a week that I'm not surprised that some can't cope.
On a vaguely related note, I gather that it's the sounds which the police who deal with child porn talk about finding the hardest to deal with.
I've been meaning to watch the documentary in the original post. Shall watch it before it's no longer watchable on iplayer.
Post edited at 18:52