Forensic geneticists and evolutionary scientists are searching
for Eve though - and others looking for Adam... a prototypical
"first human pairing", so they may, in fact, have existed: first
humans... just perhaps not quite as illustriously protrayed as
they are in Genesis, which is a not a bad explanation of "Why
people are mean to each other and often just plain old suck".
Maybe not the best, but there's some truth to the idea that you
can know *so much* about good and evil that you no longer care
anymore about your fellow man, or anything really.
In the end, I think it was an old "Don't talk to strangers"
story for children, much like the Troll under the bridge or
Slenderman a few years back in Creepypasta land.