I had an idea lately for a story with the Fae in it. (Too much immersion in Dresden and Grimm and other fantasy type media, I think.)
Anyway, as I started researching the Fae and Fairyland and Faerie, I remembered this old idea I had once. Let’s see if I can explain it without sounding too oddball.
Hundreds of years ago, before modern science, people lived in fear of fairies. That’s why there’s trees and bushes and charms and herbs and cold iron and all kinds of things meant to ward off fairies. If a fairy caught you, they’d drag you off to fairyland and you’d never be seen again. If you did get back, you’d be forever changed. Right?
It’s almost as if there’s some kind of actual malevolent force out there that interacts with human beings sometimes. Evil spirits, demons, whathaveyou. And people called it the Fae and lived in terror of it.
Fast forward to modern day and modern science. Nobody believes in fairies anymore. However, we do believe in aliens. Beings superior to humanity who live on other planets among other stars, and who, for whatever reason, have an inexplicable interest in Earth. I’m talking about UFOs, alien abductions, that sort of thing.
Aliens who take people away on their space ships, and when the people come back, they’re forever changed.
Sound familiar?
Their looks haven’t even changed all that much.

Big head, big eyes, little nose and mouth, and antennae. We’ve added leaves and wings and such to fairies. We’ve added rayguns and space ships to aliens.
But I think the malevolent force behind them hasn’t changed. It still interacts with humans and does bad things to them. As we learned more about science, this malevolent force had to withdraw elsewhere that we don’t know much about–from nature out into the cosmos.
All my own conjecture, of course. I’m just reading all these old stories about the fae and noticing how similar they are to alien abduction stories ..