I'll confess I've started writing and abandoned a number of posts about Dune for the past few weeks after seeing Vanity Fair's photos of the cast in costume for Denis Villeneuve's upcoming adaptation of the seminal science fiction (maybe science fantasy) opus by Frank Herbert.
Dune is immense, both in that it's a rather long book, itself the first entry in a six-part series (Herbert died before he could bring it to a conclusion, though given the scale of the narrative the only true "conclusion" would be the ending that the protagonists are trying to prevent, namely the extinction of humanity) and in that the broad scope of its themes incorporates all of human society, projected essentially indefinitely into the future.
I'm going to avoid summarizing it at all, because it's a very complex story and premise, and I don't want to get bogged down in the many details one needs to fully understand the scope of the story. Suffice it to say - it's on a grand scale. The fourth book (which I haven't actually read - I've only read the first three) takes place over the course of 3,500 years.
At the core of Dune is an examination of the creation of myth, and the dirty truth about messianic saviors.
Western culture is obsessed with saviors (I don't mean to say that other cultures aren't, but it's the one that I'm most familiar with and the one Herbert belonged to) - we can see that especially in religion. Figures like Abraham, Moses, Jesus, and Mohammed are all larger-than-life, paragons of virtue that those who follow them seek to emulate. While the Jewish tradition awaits a messianic figure to reestablish the Kingdom of Israel and rebuilding of the Temple (something that has been a lot more politically complicated since the founding of the modern State of Israel) and Christianity awaits a second coming of Christ, the expectation is always for perfection - that the arrival of this figure would mean a perfect vindication of religious beliefs and a utopian future to follow.
History's greatest villains, of course, have typically framed their arrival in the same way - through loyalty and faith in the tyrant, they promise an ideal transformation of civilization. To those who are not under such a zealous sway, the loyalty that people show to such people can be baffling and infuriating. Of course, this creates a tribalistic divide that often leads to bloodshed - after all, if you've embraced someone as a paragon of perfect virtue, wouldn't any opposition to that person then, inherently, be a rejection of virtue (aka Evil?)
Whatever skeptical interpretations of someone like Jesus you might believe in - for example, that he's a fictional character invented by Greek philosophers to spread their worldview - from the text, at least, Jesus seems to have the right ethics if you're a lefty-liberal who believes in non-violence, helping the poor, and standing up to the rich and powerful. So why, then, is there this divide in a culture that was, not long ago, pretty uniformly Christian?
That's more than I can answer here, but let's look at the fictionalized example of Paul Atreides.
As a head of state, member of the nobility, and military leader, Paul shares more with the story of Mohammed - which I'll just come out and say I cannot speak as intelligently about as I live in a culture where Islam is a minority religion, and a mistrusted and feared one at that, so I don't have a lot of cultural context to speak about Islam directly. Still, Paul, and his Atreides family, is introduced as a clearly upstanding one within the context of Dune's broader social order.
Paul's father, Leto, is a skilled politician in that he has managed to secure the loyalty of his people not through threats of violence, but by generally providing for them and keeping them safe. When the Atreides are sent to Arrakis to take over the crucially important planet's Spice mining operations, he makes an effort to reach out to the indigenous Fremen people and learn about their culture to better rule that world.
That being said, it's strongly suggested that Leto does this as a political tactic - things are easier and safer for him when people genuinely like him, and so he goes out of his way to be likable - such as when he orders a bunch of spice miners to abandon their expensive mobile facility rather than risk losing them to a Sandworm attack (of course, the precious spice would have been lost anyway, so it's not as if there was any big sacrifice to this move.) This act of heroism helped ingratiate him to Liet-Kynes, the de facto leader of the Fremen people.
One could accuse him of cynicism, but it would take the tone of complaints I remember Romney making after Obama beat him in 2012 - claiming that the poor had voted for Obama because of "gifts" he had given them in terms of beneficial policies. Is it cynical to give your people what they want? Or to treat your people with empathy?
Though Leto is liked, Paul, in escaping a coup that kills his father and most of his supporters, comes to hide out with the Fremen and winds up living up to prophecies of a messianic savior in their culture. These prophecies, of course, were manufactured by the Bene Gesserit, an all-female organization that his mother belongs to, but nevertheless, he meets their criteria, and when it comes time for Paul to lead the Fremen in liberating Arrakis from the evil Harkonnens, the prophecy is fulfilled.
Paul kills off the last of the Harkonnens (except not really, as it's revealed that his mother, Jessica, is actually the daughter of Vladimir Harkonnen, meaning Paul is just as much a Harkonnen as the villainous Feyd Rautha he fights in a duel at the end of the first book) and forces the Emperor to wed his daughter to him, thus making him heir to the Imperial throne.
Paul, who has fought back against evil plotters who sought to control him or kill him, has raised up a long-oppressed people, and promises to bring a better world to the Imperium. And it would seem that all of that is going to be wonderful and good.
Except.
Paul, in his time with the Fremen, undergoes a ritual with a drug related to the Spice that grants him prescience. He can see the future, whether through some kind of perfect awareness and ability to calculate how society will act (he's been raised by his father to be a Mentat, which are the human computers that have replaced digital ones after the long-ago Butlerian Jihad) or if he's gotten some mystical precognition is left deliberately fuzzy, but he can see the consequences of his actions.
And the horrible thing is that, while what he has done has, ultimately, been good for the universe, there's still going to be billions of deaths as a result. The Fremen, their faith vindicated by Paul's victory, go out into the universe to spread faith in "Muad'dib," but as mentioned before, those who are so zealous in their faith can see skepticism as sacrilige, and even before they do it, Paul can foresee the murderous jihad that the Fremen will wage against the rest of humanity.
Worse still, he has to let them do it, and even encourage and order them to do so, because the prescience he is granted shows him every branching path the future might take, and that means a narrower and narrower path of what he must do to prevent the extinction of humanity.
The story of Jesus is one of profound self-sacrifice and nonviolence. Jesus gives himself up to be executed in one of the most horrifying and gruesome ways that humans have invented (the word "excruciating" essentially means the kind of pain one would feel being crucified) as a message to stand up to the powerful and not fear death. But others have, in Jesus's name, had people killed and tortured in similarly horrific ways. Wars have been waged in his name, and people have even fought over differences in interpretation of his message (very subtle ones, too.)
It's hard to say what the world would be like now if it hadn't been for the rise of Christianity. There were several other nascent religions arising in the Roman Empire at the time that Christianity became prominent. Had Constantine chosen, say, Mithraism instead, which was a soldier's religion that involved being baptized in blood by having a bull slaughtered over you, might we have descended into a horrific fascist nightmare (you know, more than we have in this timeline?) The problem with such narratives, of course, is that people can defend all manner of terrible things by claiming some "ends justify the means" mentality, such as when a taxi driver tried to argue that black people were better off for having been enslaved and brought to America (which... ooh boy that was an awkward conversation, though I'm glad I had the presence of mind to tell him he was wrong.)
And yet, when the scale is arbitrarily large - a universe colonized by humanity where a planet of billions being slain is not going to cause all of civilization to collapse, and where the longterm goals are in the "how far can we imagine in the future" range - moral questions do become a complex thing.
Paul Atreides goes through a classic hero's journey, and yet Herbert insists on questioning and undercutting the very notion of heroes. Eventually, Paul's son Leto II undergoes a transformation into something inhuman and becomes the God-Emperor, the most brutal tyrant humanity has ever - and if he succeeds, will ever - seen. Leto II's goal is to wean humanity off of this desire for a savior, and even as his 3,500-year plan comes to fruition, he has his doubts that his goals were all worth the pain, suffering, and death that he inflicted.
It's natural to bring up Star Wars when talking about Dune. The high fantasy-like feel of Dune's futuristic feudalism is an obvious point of comparison with Star Wars, not to mention a prominent desert planet and a galactic empire (though Dune's claims to be universal.) The original trilogy had a much easier hero to embrace - Luke is never in it for his own power. He wants to fight to free the Galaxy, but he's not in it to become the new Emperor - he wants to leave the political power to others, and just throw off the oppression of the Empire and redeem his father.
Ironically, the sequel series (which I think was primarily for Disney to capitalize on having acquired one of the most profitable film franchises of all time) manages to introduce some of the complicated issues that Dune deals with. Luke, for instance, has to grapple with the fact his own messianic reputation led to the overconfidence that failed his nephew and undid all the good that he and his friends had accomplished in their youth.
Even though you can read the first Dune novel as a purely heroic story of good triumphing over evil, doing so would mean ignoring the core of its themes - that humanity is messier than such things, and the greatest good can wind up inflicting terrible evils.
There's also stuff about capitalism, environmentalism, and transhumanism, but those are all subjects I can't fit in this post.