The main thing I think is that we are in an era of profound disillusionment with current systems, some of which is justified. For this reason many people have gone into things like NRx, alt-right / neo-fascism (they are not quite the same), and also into hard left ideologies like Neo-Marxism or even a revival of old school Marxism. People are looking for alternatives. The answer someone might have for "why did you go NRx" probably overlaps a lot with someone else's answer to "why did you go Leninist?"
NRx is particularly appealing to the hacker crowd because its popularizers successfully packaged it as transgressive and rebellious, a packaging that is paradoxically modern. It's also unapologetically elitist. There's always been a strain of that in the hacker world, so it fits that nicely.
As far as why there's so much elitism in the hacker world I could write a treatise on that. Maybe I should. Short short version: many people with these interests were socially excluded as children while simultaneously being told they were super-intelligent, resulting in a pretty serious mind-fuck. If someone asked me to design a brainwashing program to turn kids into sociopaths I'd basically describe my childhood, and I know for a fact that many others in the hacker world have similar experiences. I've worked hard to deprogram myself but I have sympathy for those who haven't as few human beings ever recognize that their youthful neurological imprints are maybe not optimal.