I was reading the concentration camp thread and I think 9 is very young to see pictures of bodies in mass graves.
I first saw a picture of a concentration camp when I was 13, and I was shocked, very angry and so very sorry for those people, which I think is the normal, reasonable response to seeing those photographs for the first time or even the hundredth time. They are that emotive. The picture I saw was of a pile of bodies, not all dead I don't think, but all thrown together for disposal anyway.
And I think that's quite a complex thing for a 9 year old to deal with. It's not about sheltering them as such, but those pictures are always going to be shocking so why not wait a few years more so that children are perhaps better able to process what they are seeing and talk it through, especially at school where a class full of students will see them together.
Some children will always be more sensitive to these things than others (or perhaps just as fair to say some children are more hardened IDK, sensitive can be seen as a negative thing to be) and as parents we know our children and what they can cope with. That's why some young children are watching 15 films at age 9 and others are still having PG films vetted before they view.
I wouldn't ever want to put a set age rating on information or education but how many parents would be happy if a 15 film was shown at school to a 9 year old?
It's a choice that is easier to make as a parent for your own child than as a teacher to a class of 20 or 30 children who all have different sensitivities.
At 9 I would expect more children in a class to not be ready to see pictures of a mass grave than I would at 13, where I think more of them would be more prepared for it, although no less shocked or appalled by the cruelty. Just more able to deal with the feelings it has given them and more able to discuss it. So in this case I don't see the harm in waiting a few more years to show the worst of what happened.
I disagree with the lady on your programme though. That's a very different thing and although she may be right about her child, they could see a hearse on any street or on TV at any time and she would still have to explain it. But at least one to one with her own child means she could approach it in the right way for her particular child.