They began by controlling books of cartoons and then detective books and, of course, films, one way or another, one group or another, political bias, religious prejudice, union pressures; there was always a minority afraid of something, and a great majority afraid of the dark, afraid of the future, afraid of the past, afraid of the present, afraid of themselves and shadows of themselves.
Ray Bradbury, Usher II (1950)
John C. Wright, Science Fiction author and a convert to Catholicism, laments the ruin wreaked on Science Fiction by leftist ideologies and pathologies:
Establishment SF is Politically Correct SF, in that it pays slavish homage to all the tired tropes and foolish dogmas of Political Correctness. With its emphasis on collective rights, victimology, and radical egalitarianism, there is no place in the PC SF universe for things like heroes, adventures, inventors, exotic locations, space princesses, or technology portrayed as beneficial.
Politically Correct SF is astonishingly parochial, because it is always assumed that the society of the future will be caught in the grip of the selfsame political controversies as the Victorian Age, which is the age when this worldview was first formulated by Marx. Hence, for all other SF stories, the future differs from the present. For PC SF, the future is just like the past, and nothing changes.
Go here to read the rest. I started reading science fiction in 1965 and I have read it ever since. It gives me considerable grief to see how a genre famed, at its best, for iconoclasm and free thinking has largely become a sounding board for leftist orthodoxy. Time to call on Commander Eddington again who I think can be taken as a symbol for those science fiction authors who refuse to be cowed by the leftism that now dominates their field: