Originally Posted by
vitruvian
I get the concept of suspension of disbelief just fine. It is this: to paraphrase Coleridge, if the author wants willing suspension of disbelief for the moment from the readers, then the author must procure it by providing in turn 'a human interest and a semblance of truth' sufficient to that purpose. The suspension of disbelief towards fantastic or implausible elements of the story does not and cannot be expected to come 'free', it must always be earned by a serious effort at providing verisimilitude in other aspects of the fiction. Common elements that help provide a 'semblance of truth' include plausible or at least relatable character reactions even to the implausible (i.e., 'human interest'), and internal consistency as to how the fantastic elements work and interact with the more realistic ones.
Another way of formulating this is by reference to Tolkien's concept, not of suspension of disbelief (which he considered a misnomer because readers rarely believe in the literal truth of the story), but rather of 'secondary belief' in the 'secondary creation' of an internally consistent fictional world.
Of course, depending on the genre of fantastic fiction, a lot of this work has already been done for new authors by the establishment of well-accepted patterns or 'tropes' concerning how things tend to work in certain types of fictional worlds, and while deconstructing those patterns with an eye either to absurdity by way of commentary (e.g., Last Action Hero, One-Punch Man), or to providing an even more internally consistent and plausible if not precisely realistic world (e.g., Moore's Watchmen, Martin et al's Wild Cards, original stated purpose of New Universe) can be one way to tell a story, just using those tropes in a genre-consistent and unironic way also remains a valid choice.