Cool thoughts.... I see the connections you've made... a life of almost repetitious boredom likened to a living hell, and then what sorts of circumstances would be a living hell, such as the fate of the woman you described.
Witnesses (and many other groups, tribes, nations, sports fans?) are trained to be so cold and dispassionate about the fates of anyone "not one of them" - the "other" - that a disconnection takes place in their minds which makes heinous acts acceptable, yet if a person really put themselves in the "other's" place, they might have to really stop and question what they are doing/ thinking/ believing.