this might be a little off-topic, but I don't know where else to ask

i saw a video simulating the real time unfolding of the chernobyl disaster and it blew my mind how much the engineers ignored every warning and security measure possible

(yt link for those interested: https://youtu.be/WMr3-ShzB08)

why would they do this? i'm not a nuclear engineer, but i'd much rather risk my job, my career and leave millions of people without electricity than push the safety thresholds even by the tiniest bit. trying to look for explanations online leads to liberal, anticommunist bullshit like "russian incompetence" or "they wouldn't dare question the generals" or whatever. i want an actual, technical (and social) explanation without any liberal bias, which is why i'm asking it here