*sigh*
I can't let the verbal sparring go un-opposed! (And yes, Your girlfriend has many bovine features, including the tenacity for chewing with an open mouth for hours on end, knobby knees, poor hygiene, and loud bellowing! ALso, your mother was a hamster, and your father smells of elderberries!)
Arx-- The statement I made about how they behaved like the alt-left still applies. By alt-left, I mean the kind of people who instantly associate anyone even a few meters away from a nazi rally as being nazis themselves, and go out of their way to paint them that way, and doxx them on the internet, and ruin their lives. (and feel justified doing so.) This is quite similar to the "Anyone living on the surface must be in league with the star-devils!" mantra, and leads to equally irrational behavior.
It is true that the protag is treated specially, because he is an important source of information. That is not really the telling thing. Rather than kill him on the spot, wipe his memory and kick him out, or take him for one of the gruesome torture orgies you seem hell bent on fixating on--- they instead detained and questioned him. Surprisingly civil for a species of psychopaths, no?
As for your rebuttal about the culture being unwilling to have defectors-- Again, compare to North Korea. There is a literal cult of personality there, where the fearless leader is literally considered infallable, and near unto a god. Literally venerated and praised in every home. The ideology that the world outside the Juche territory is a dystopic horror filled with unimaginable suffering is a staple. MOST PEOPLE ACTUALLY BELIEVE THIS in NK. It is only the people that have come to know differently through outside exposure, or exposure to media that paints a different picture that are willing to defect. The penalty for defection is very very high. Several generations of family members are sent to die in gulags for a single member of their family defecting. Naturally, most people you would ask in NK will be unwilling to defect. Does that make them "Evil people"? You are implying very intently that they are.
The current elite of the mound, hold their positions based on the narrative that the outside world is evil, and will destroy them. Their leadership is ancient; literally millions of years old. They have had AMPLE time to contemplate the dangers of outside ideology entering their community, which is exactly how the notion that anything on the surface must be contaminated by the old ones came to be. In the antedeluvian epoch of the mythos world, the old ones ruled supreme, and their ideologies ran rampant. It was the contamination of these ideologies-- the worship of gods, the culture that this worship produced--- that was considered evil. The threat was, and always has been cultural contamination. In their new immortal condition, the influx of outside ideas from a very populous group in contravention of their own rule is seen as a massive threat to the social heirarchy. Naturally, the leaders want to know all about the surface, so that they can use and turn that knowledge to further sustain their rule, should another breach occur. However, security increased with the door, did it not? Clearly, a peaceful denizen from the surface is much more of a threat to their power than is a deranged cultist wearing an octopus hat, and shouting about yog sothoth.
As I discussed briefly with Whispers, the now "very entrenched" culture is of a willfully capitulating underclass, ruled by an over-class. The willfully capitulating underclass is liberal in its behavior, but is totally unwilling to engage in any action that will upset the power structure, as that will send the enforcers (who are likewise ageless, and have just been *WAITING* for any sign of disloyalty, oh yes-- WAITING PATIENTLY---) into a frenzy, and they do not want that. His suggestions of leaving and going to the surface are treated with the same kind of "are you fucking nuts?" as would a "You should totally overthrow your government!" type statement is given here in the US.
The part about him being black, which you countered with a literal from the text "I am white"---- Is your reading ability compromised? I was USING AN ANALOGY. He is a "Black man", (eg, "Shaped the same, but clearly not the same as" type of 'other' in their society.) among
"white people". Yes, he is a white HUMAN. But he is a HUMAN among ALIENS.