I know it's stating the bleeding obvious, but too many people die, are kidnapped, raped, tortured, sold into slavery etc to report them all. I suppose then it's all about looking for the most newsworthy stories, or else the news would just become statistics and then few would be interested.
Kinda like in Iraq or Pakistan or some other place where 100 or so people would be stood shouting and burning a flag in a square, so the cameras focus on that instead of the miilions of other people there just getting on with their lives.
Suppose the critera for any journalist is find a story or make one
