It's so frustrating when you are looking for posts to secure your browser or mobile and it's filled with comments like "Le gubberment bad". Or how not platforming Nazis is "1984 censorship george orwell"! I mean, from a Marxist point of view, distrusting the US government is good but the reasons that these rats give for their actions is infuriating to read.
Short Answer: the 60s.
Slightly shorter Answer: The left/right split in the STEM stoner crowd during the 80s as some of them got rich. See also Transhumanism, Space Nerds.