Yes, I do believe in fairies, in the sense of beings and entities from other 'dimensions' visiting and interacting with people in a number of different ways.

These days, due to mans knowledge of astronomy and astrophysics - space travel and a more universal perspective - it is believed that these beings must now come from outer space - your aliens, UFO's, extraterrestrials. But in olden times, you have to remember - outer space, the billions of stars and galaxies, the eternity of the universe etc., were a complete unknown, a blank mystery, didn't exist in peoples psyches yet[!] So, these very same beings and entities the fairies [goblins too] to them, must be coming from the vastness of the great dark forests [where else?] which people of those times did know about. That's why the idea of fairies [goblins too], from the bottom of the garden and the forest, is still part of culture and folklore today. It hasn't disappeared.

And neither have the beings and entities - in my view.