I think it is almost more important to highlight the plight of a runaway than it is to highlight a child that has been abducted.
I realize I am going to get slated for this, but...
If a child is abducted by a stranger there is almost no chance that that child will be found alive after the 1st 24 hours. But a child that runs away may be found, and helped. So why is the runaway less signifficant?
And i absolutely believe that the status of the child's family has everything to do with how much media coverage they receive. Madeleine mccann's disappearance made world news, for months. And yet a child disappeared in spain a few weeks ago, and even though it was briefly reported on the news that's all anyone has heard about it. Her family were not doctors, and don't have a media spokesperson or a wealthy backer.