A lot of high fantasy ends up being a slippery slope towards fascism. I'm not saying that Tolkien is a fascist (I don't even know), but popular fantasy does tend to draw fascists since romanticization of the past is a symptom of fascism. C.S. Lewis was also an open Christian apologist.

And as for sci-fi, a lot of that gets lost on people. We can only talk about capitalism in public through cyberpunk. We can talk about anti-racism and embracing of sexualities through Star Trek and some Bioware games when they were good. Star Wars was influenced by the Vietnam War.

BuT Im A ChUD. ThAt Ne0n PuRpLe STUFF IZ COOL.