I hear what you’re saying, there are definitely just amoral engineers who truly don’t care. I think the plurality though (and this goes for all disciplines, not just engineering) will start to feel queasy if the impact is too clear and visible. Those people need to stay with the program, as there aren’t enough purely amoral engineers/marketers/PMs/etc to keep the ship afloat alone.
Believability aside (I do think it’s believable personally) this is pretty much how “evil” (from outsider perspective) is done at every company, including mine. Inside it’s all sprint meetings, KPIs and terminology that are either intentionally or unintentionally designed to keep engineers far from thinking about impact on real people. It’s easy to convince a 25 year old whiz kid to optimize human assets, it’s just like Factorio and it feels good to see the number go up. In-jokes and dark humor fly and it all feels not real and just like a game. Sometimes on purpose by management, sometimes automatic as a coping mechanism. Defense (my field) is very much the same way.