Onc
At least, for most of us. Again, some of the resistance to a simple descriptive distinction between two different literary techniques seems to come from a visceral hatred for the very concept of a lawful, intelligible universe, physical or (especially?) social..
I think you may be reading too much into it there. I'm about as pro-science and rationality as you can get as far as real life and politics are concerned. I just don't think that applies to art or entertainment . . . which is all about imagination.
And relative levels of plausibility or believability don't really matter all that much when it comes to distinguishing sf from fantasy or whatever. Nobody actually thinks that talking chimpanzees are likely to take over the world someday, but PLANET OF THE APES is still regarded as a classic science fiction movie.
(And if we're going to argue that PLANET OF THE APES, along with STAR WARS and STAR TREK, isn't science fiction, then we're really going down the rabbit hole into some sort of alternate universe where the term means something completely different than the way it's always been used.)
To digress slightly, it does seem like some fans are overly concerned with protecting the precious bodily fluids of sf these days. I admit that a lot of my posts have been in reaction to that fact that, for the last year or so, I've seen a rise in what I think of as "sci-fi snobbery," to the point where it's almost impossible to visit some sort of fannish message board or website without running into militant posters who get positively incensed at the notion of lumping "proper" sf in with vampires or wizards or whatever.
Just the other day, I was reading a thread on
Grimm (at another site) and, sure enough, the very first post was from some grumpy sf purist objecting to the show's existence on the grounds that it was another goddamn fantasy show and not legitimate science fiction, while yet another poster protested the use of magic and supernatural elements
in a show about fairy-tale creatures! (Imagine that.)
Look, I think I know what's going on here.
Star Trek and
Stargate are off the air, space shows are out of vogue, and urban fantasy, steampunk,
Harry Potter, and
Twilight are currently ruling the roost. But this seems to have provoked a weird backlash in which a certain segment of fandom seems determined to man the barricades to protect "real" sf from all that "irrational" fantasy and horror stuff.
Part of which involves pointless debates over what really qualifies as SF--in order to avoid further contamination. Often with the implication that the popularity of, say, vampire fiction is somehow hurting science fiction and maybe even civilization. None of which has anything to do with the actual entertainment value of any show, book, or movies.
At least that's how it looks to me.
End of rant.