Seems like the material human cost of space travel never even occurs to them. The poor indigenous people who mine the precious metals and iron etc. that make the spacecraft, the massive costs of feeding and housing all the engineers and scientists working on Musk's futile vanity project -- none of that is even on their radar. They reason that because SpaceX is more efficient and cost effective than Boeing/Lockheed/Northrop that Elon deserves all the praise in the world. In their eyes, Elon is "selflessly" dedicating his time and money to "saving" the human race by making it multi-planetary. The OP calls anti-Elon people "cultural authoritarians" fueled by "billionaire-hate" who want us to be "imprisoned on this planet forever".
Imprisoned on this planet???????
Are you fucking kidding me? Every good thing a human being could possiby want is on this planet. What's on the moon? Grey rocks. What's on Mars? Red dust. There's nothing out there. There's really nothing in space worth having. If you're not happy on earth, that's not a problem with earth, that's a problem with you (or the social or economic structure around you). Moving to a new planet is not going to solve your self esteem problems. That whole thread is just full of so much bullshit.
In Gundam the poor actually move off earth to the space colonies and space stations while the bourgeois and the government remain. Funny, we're going to have an inverse of the universal century.
Material conditions will likely force exactly this to happen sooner or later.
Living in metal cans in space is just not ever going to be as nice as living on a planet. As soon as the bourgeois realize this, they'll be looking to ship the regulars off planet.
We'll be in for a ride wild if space working robots with pilots inside start getting developed along with it. I like the UC but I wouldn't want to live through a space/global interplanetary war.
Let's just build the Devil Gundam already.
I'm ready for my robot nanobot overlords.
Oh hell yeah!
Also, in Warhammer 40k, Earth (known as Terra in the setting), Earth is basically the Vatican, the capital of both the Imperium and their religion, as well as a place only the most powerful of the most powerful of the most powerful live.
...It's also kind of a shithole with no water and vegetation, as well as mostly uninhabitable, since we gotta keep it as grimdark as possible.