Wrong again eldar. Its not about any element, but elements that could not possibly exist without a supernatural or magical base. Werewolves are part of fantasy, and stretches into horror in how it is depicted. The aspects of Star Trek are theoretical and during the day it was first envision, was a technologically a possibility while supernatural vampires are impossible to exist.
The problems with many science fiction novels and stories is that they focus too much on the fiction and not enough on the science, but that is a different discussion altogether.
Bottomline if a game, novel, movie, or whatever has supernatural elements that are an impossibility it is fantasy. How that fantasy is portrayed, may that emphasis be generic, horror, romance, space opera, whatever does not change the fact that it is still fantasy.