I've just come across this site:

http://uk.missingkids.com/missingkids/servlet/PublicHomeServlet

And that awful question rears its ugly head again - why did none of these kids hit the headlines like Madeleine McCann? Some of them are babies, for God's sake! But of course, they almost all fit the wrong demographic. Too poor, too ethnic, too unphotogenic. Perhaps their families didn't speak good enough English. Families who are sitting at home now, wondering why their child never got this much attention, and thinking that maybe, if they had, they might have been found.

Visit the site and weep. Because really, if something bad happens to you, it really helps if you have had some good photos taken first.