Star Trek is properly science-fiction. It attempts to depict how technological progress will change society and humanity. Star Wars is not interested in technological change at all. Star Wars is about mythology and the kind of human emotions that we take to be unchangeable and eternal - ethics, loyalty, friendship, heroism etc... Star Trek, for its part, does not seem to believe that there is such a thing as an eternal human nature. Star Trek tries to show what would happen to humans under radically improved economic and social conditions. What would we do with our lives in a world of absolute plenty for all? What kind of people would we become if we were to devote ourselves to the pursuit of knowledge and science? What would be the meaning of life and achievements if work is no longer an absolute necessity?
These questions are about the future, our future. Technology is fast replacing old forms of human labor. It is creating plenty, at least for some, and it is making us much wealthier and well-off as a society. At the same time, the coming of robots is also fraught with dangers. How are we going to negotiate the transition? How are we going to change?
Star Trek compels us to reflect on our future and on our place in it.
Star Wars on the other hand is more interested in present moral dilemmas. Incidentally, this is probably why Star Wars is more popular than Star Trek. It is entirely devoted to explore today’s moral questions. We can all identify with Star Wars characters. We can all relate to them. Under their make-up they are like us, with the same fears and the same emotional wounds.
We are all Anakin Skywalker, the lonely and angry child who must grow up in the unfair world of adults. None of us is Spock - wise, logical and altruistic. Someday in the future, maybe.