What lies beyond the darkness?
Humanity has come to fear the unknown. In most cases it's our own instinct for self-preservation. In the case of our ancestors, it made since because we didn't yet have the technology to defend ourselves from things that could kill us (early hominids weren't quite on the top of the food chain). Today that same instinct keeps us safe from other humans (mostly scam artists, thieves, and psychopaths) and the occasional swamp monster.