I remember I wrote something this for an NRP once. Basically it was styled as the average new to NRP ubernation with a strong, massive military and an all powerful government with no opposition, but I tried to see how those things could feasibly and realistically work. While sure not as dark as Nazi death-for-science summer camps, what I ended up with was a fairly grimdark nation for what was supposed to be a relatively average NRP.

Yes I had a massive army, but that was because I was literally having children, the elderly and the sick go straight into the meat grinder a la Volksstrum style. It was well equipped army but that was because my entire economic industry was geared to warfare out of desperation to the point civilian goods are nearly nonexistent and starvation is a problem. There was no opposition to the government because they brutally removed any such thoughts since the government was just that fragile. Basically they were the arch typical martial pride race before getting their shit stomped in so hard their planet was turned into a wasteland and their species was being hunted with immense hate from just about everyone because of their previous wars and raids.

I guess you could call that one more of a deconstruction, but it did have the whole "survival over ethics" idea behind it. Although I will say the most time I see people using this its rather for smut or talk-out-of-your-ass philosophy of nihilism or absurdism where nothing matters and everything is pointless and boohoo edge, angst and darkness.