Earlier quoted context omitted.
I don't see how programmers are super conservative. In my experience, especially on HN, they tend to be fairly progressive on average. However, they also tend to be somewhat libertarian. And so far, software development hasn't been an industry that really needed unionisation. But that could always change in the future, of course. Personally, I generally support unions, though I don't see the need for them in software…
I've found that programmers tend to be socially liberal (pro-gay rights, abortion rights, etc.) but financially conservative (don't like their money being spent on public goods). Which somewhat overlaps with libertarianism, yes.
That said, I do think American-style right-wing/capitalist libertarians are overrepresented among programmers compared to the average public, as are left-wing libertarian socialists/anarchist.