Echo Nova

The last remnants of the US government, living in a bunker following the nuclear apocalypse, in which the first generation of inhabitants are implicated but with that implication never actually rising to the surface (with later exposition revealing that they weren't the ones who pulled the trigger, but they were still the ones who build and maintained the gun)

Surviving by literally extracting the blood of those around them, whom they view as subhuman (and with a tragically unspoken racial dynamic to the bunker being very white and the outside not). And then finding the space kids and adopting a plan of get those kids and their kids to grow up and mix gene pools, after having not done that with the outsiders for however many years. (which ties into the show's fast&loose eugenicy way of looking at genetics, which is one of the show's weaknesses)

The fact that its very explicit that everyone knows about the kidnapping and killing people to survive. It's not something to be revealed to shock people into changing their ways, it's something that a) everyone knows b) basically everyone is fine with c) the handfuls of people not fine with it largely taking the position of "well we'll kill less people, only when we feel we actually need to". Its a ugliness everyone knows about and tries not to think about much.

And then the ending, the fact that our protagonists choose to break their systems of subjugation, resulting in them all dying badly. Maybe another end could have been found, but their leaders chose to tie themselves to power over the outsiders so thoroughly that breaking that power kills all of them. Going to their death saying "we had no choice, we had to do all of this".