I think you have made a very strong argument that the internet content is not particularly damaging. As you assert you can see some pretty horrific stuff and just move right along. Of course seeing a picture on the internet is different than real life. Seeing that stuff in real life would be seriously damaging. Seeing it on the internet is "meh." I'd also like to add that I don't believe I've ever personally seen pictures of mass graves anywhere other than conventional media, television and news magazines. Yes, everything is on the internet, but if you're not looking for it you're not generally going to find it. And if you're looking for it, you're likely not going to be seriously harmed by seeing it.