HN seems loathe to have any meaningful discussion about or reflection on how and why notable SV figures seemed primed to embrace the Trump/MAGA right (see, for example, quote in OP from Chris Rufo). I don't think it was simply being repelled by the left, as Andreesson has stated before, but an earnest rightward turn. Also, after articles like these, will calls for "viewpoint diversity" finally apply to conservatives…
The fundamental difference is that conservative viewpoints support the majority (or plurality), whereas the liberal viewpoints support the minority view. Backlash against the majority view is much harder to come by. And being in the majority and supporting minority perspectives is more uncomfortable, and frankly much easier to opt-out of if there is sufficient discomfort.