Not just the media. It is everything from the movies, novels, video games, and a general coursening of language and civility within society in general. Each time we see blood, gore, violence, man's inhumanity to man as entertainment or business as usual, again and again that part of us that inately rejects such things dies a little I think. And we become desensitized and less repulsed or offended or bothered by it until it becomes normal to us and we can just shrug it off, ignore it, or make fun of it, or even come to embrace it.
And I'm not saying that is a good thing.
That is the theory I'm rejecting. We do not become "desensitized" by the examples you provided because we live in such luxury we never are faced with being sensitive. Have you ever read the piece on Simulacra and Simulacrum? (Matrix fans should know this one....)
I did misread your earlier point, and I apologize. I try not to do that.
But despite being a diehard Matrix fan, I don't agree that we are desensitized by virtue of being born into luxury, at least as compared with most of the world. I know too many people who are more than sensitive to the hungry, thirsty, naked, sick, imprisoned, etc. and who feel a keen responsibility to help relieve their suffering. I know too many people who get no pleasure from gratituous violence, pain, and suffering in film etc. and are sickened, distressed, and/or offended by it.
But I have also witnessed the desensitizing that such influences can affect in people too. And I still don't see that as a good thing.