this is rather tricky.
i think it is okay to show autopsy photos as long as it is for research, or the like. I admit, I do look at them, but that is because I have had a long standing interest in the criminal/forensic anthropology field. I have several books on the subject.
I watched Autopsy a while ago when they did the actual autopsy on a man who had died from something to do with alcohol, i forget what, but anyways, as I was watching it, I was thinking to myself, wait a minute, how could that man have given his permission to have him cut up on television (i know it was HBO, but still, its tv) and that is something I don't like the idea of.
But there is something that I believe should happen - young people who are freely having sex without protection, using drugs, whatever causes them to destruct their lives, should watch an autopsy of a person that died in the manner that is causing their trouble - I recall they did that on one talk show and it upset some girls. Just a thought.
As for concentration camps and genocide, well, I think they should be shown because it is basically proof that they happened - there are still some non believers out there (how they don't believe, I dont know, but its disgusting). I went to the Holocaust museum in DC last year and I couldn't believe what they did to the peopl - it was sooo disgusting, but until then, I had no idea of the magnitude of what Hitler and his people did. The thing that still touches me now is the shoes. I have goosebumps right now, thinking about it.