> Programmers, maybe ones on HN especially, are super conservative and anti-labour for some reason. I don't know the history of Silicon Valley enough to figure out exactly why

That's not quite right, HN is full of anti-labor libertarians. And I think it has something to do with startup culture, which is a lot about working to get a golden ticket to join the capitalist class. That causes a lot of people to identify with that class and its interests, despite actually being laborers themselves.