Having spent all that time getting away from South Africa, running away from the army, I wanted very much to believe that America and England were actually as free as they were meant to be, not slipping rapidly into becoming police states like the one I'd just left.
Britain has had a very honourable tradition of literary sci-fi - H. G. Wells, John Wyndham, J. G. Ballard, Brian Aldiss, Michael Moorcock - but for whatever reason, they have never really been given the time of day on screen.