> My point was that some mainstream authors sometimes stray into the
> speculative genre.

It's slightly worse than that, Helen: as soon as someone who's highly rated in more literary genres produces something which might be called SF, They Who Write The Rules sniff loudly and move the goalposts. If provoked, I'll provide a link to the quote to the effect that the one foe that the Blake's 7 crew could never defeat was the BBC's "long-standing apathy towards science fiction".