What is wrong with these people?

What the hell is wrong with these people?

Any story involving a missing child is heartbreaking. But this story comes with an extra dose of heart wrenching horror:

http://www.cbsnews.com/blogs/2009/11/05/crimesider/entry5535680.shtml

The child's mother gave (gave??) this baby to her baby-sitter. This little angel was found in a box, under the baby-sitter's bed. She was obviously not meant to make it out alive...why else would she be stuffed in a box and hidden behind junk, like a box of Christmas decorations?

FORTUNATELY, baby Shannon did survive. She is now in protective custody with her cute little self. Hopefully, she will be placed in a loving home, and never see her mother again.

Why is it so easy for assholes like this to reproduce?