It's common for ideologically committed users to see HN as being aligned against them. But this perception is in the eye of the beholder, i.e. it's a cognitive bias. Plenty of comments make opposite claims about HN; the difference isn't in HN but in what the commenter identifies with.

Edit: I've written about this in plenty of places: https://hn.algolia.com/?sort=byDate&prefix&page=0&dateRange=.... Not all of those posts are about perceptions of political bias; some are about perceptions of astroturfing. But the two phenomena are variations of the same thing.

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