Again, common sense is seriously lacking in today's world.
That is why we have stupid lawsuits every day.
However, even the highest doorlatch can't protect a child from a predator if he is already in the house or if the child is outside.
You're right. I really hope for the family's sake that if something has happened to this little girl, and I'm praying that it hasn't, that the person responsible wasn't someone they invited into their own home.