Read my post, Silas. Look at the ways a child left alone can be hurt by normal people doing ordinary things.
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Near my house in a convenience store called the Quik-Trip. We have all learned that Quik-Trip customers cannot be trusted at all. Don't expect them to follow the rules of the road or to drive fairly. (A friend of mine told me that QT sponsors the most violent shows on TV.)

For a while, the QT customers frequently left their cars running as they raced in for beer, videos, or ciggies. A thief would hang about and steal those cars. Piece of cake, right? The sixth time, the thief made off with the vehicle, heard a funny noise, and realized with horror that there was a young kid in the car. S/he abandoned the car one block from the store, where police found it. The child was still in it.

After that there were no more car thefts at our QT. The thief must have decided that those QT people are not just stupid, they're dangerous. They can get a simple, straightforward car thief involved in the terrible felony of kidnapping, just to get their ciggies quicker. I have to agree.