"Dune" actually a far better book then Starwars ( Space Cowboys, where Cowboy films were popularize and being replaced with war movies ), could ever be.
It actual reflects the current trending events and the oppression involving the "1982 Oil Crisis"
The three places reflects the actual forces in the real world......Stereotypical speaking. Of course this view could be different in your eyes as well.
Arrakis = Iraq. The Spice AKA "The Oil"
Caladan = Most likely England being portrayed as the positive 1960's equalizer. The water/castle planet. They are seen as proper posh people living clean lives in harmony with nature.
Bene Gesserit = monks, nuns, women of Islam, usually female with historical knowledge being passed down. With psychic powers of manipulation. They also hold the DNA in which to create a god like person but limited to a man.
Corrin = preservation of mathematics AKA machine related empire. Those who move people without moving via god like abilities.
Giedi Prime = old_world or old-man still living the old ways. Could be described as a city world, a dystopia. The flesh, the physical, denying people of normality. Altering them to be drug dependent. Could be like a big city like NYC, or LA, to even Chicago, or old-Detroit, Dallas
Kaitain = USA being seen as this over-seeier of other worlds.
Lafayette Ronald Hubbard AKA founder of Scientology was a ________. One of the many cults and followings to arise out of the 1960's. Guy was soo close to taking control over an entire city until the government crack down on him. Their are tons of cults like his in many other forms, from star-gazers, to various antagonistic groups. That was the 1960's insanity for you. It even continues till this day in various forms.
Hubbard ( like myself ) believe this world he would "day-dream / imagine" was more real then the world that we were in. Like how you hear voices, or
could manipulate your dream. So I imagine he was probably in theta mode, or whatever that mode when your mind is not awake nore asleep for most of his time.
I do not see no problem getting lost in your imagination when it is more realistic then the real world.
At least he was not Bill Clintons brother on the cocaine spinning around in his under-wear at night.