I received an e-mail today warning its recipients to watch out for a missing child. Before I did anything, I Googled the chid's name, viz. Reachelle Marie Smith
As I thought, it's yet another hoax, or urban myth, and the child's picture changes with the story.
Why would someone do anything like this, given that too many children are murdered or stolen in our society. People who do this sort of thing must be completely lacking in any moral decency, and empathy for those who have lost children in tragic circumstances.
If you get one of these, tell the person who sent it to you, and then delete it.