I got this link from my subscription to the e-newsletter SciTech Daily. The article is in Science Daily. Troubling, but I can see their point :-(
abstract: Follow your intuition and act? When it comes to genocide, forget it. It doesn't work, says a University of Oregon psychologist. The large numbers of reported deaths represent dry statistics that fail to spark emotion and feeling and thus fail to motivate actions. Even going from one to two victims, feeling and meaning begin to fade, he said.
[read the article]