Vintage science fiction, “naive” or not, inspired young people with the awesome potential of science, and motivated them to study science and engineering, and build the space program and the Internet. I have the impression that modern science fiction has abandoned this important role.
One reason is a general decrease of optimism in society in the last decade after 9/11. 9/11 and all that followed had a huge, negative impact on the zeitgeist, which is now timid, over-cautious and often defeatist.
Another reason is a certain (pseudo)”intellectual,” (fake)”liberal,” “cultural” (all scare quotes intended and deserved) fashionable apology of weakness and mediocrity. There seems to be a crusade against strength, determination, courage, ambition, confidence, optimism, and “Western culture” in general. Of course, women are always good and men are always bad, especially if white and straight.