People's assessments of the community's ideological bias are wildly contradictory, so they can't all be right and—since HN is the same for everybody—they don't vary with HN. What do they vary with? This is easy to answer once you know to look for it: they vary with the the ideological preference of the observer. Moreover the correlation is in two dimensions: 1) direction: left-leaning users think HN is right-leaning, and vice versa; 2) intensity: the stronger one's ideological commitment, the more strongly it feels like HN is opposing it.
We detached this subthread from https://news.ycombinator.com/item?id=14205096 and marked it off-topic.