You can turn his argument around. Why should the needs of a business search be more important than historical search or journalism search? Maybe, on average, users more often want to learn about the historical accident than the resort. Or maybe Bing and Google are providing a better information service by showing those images.
I'm not sure this is necessarily the case, but the normative standards are much less clear than is depicted in this article.
That argument would hold a lot more water if searching for "accidente" with the camp name didn't remove all the pictures of the accident. The pictures of charred human remains only appear when you search for the name itself.
I am just speculating but may be the choice whether the thumbnails are shown or not depends on empirical data of now many people have chosen to go to images.google.com (by clicking "images" link) after making a web search.
I'm not sure this is necessarily the case, but the normative standards are much less clear than is depicted in this article.