You've got it backwards. In the Glorious Hacker News Golden Age that people sometimes speak of, Hacker News tended to gravitate towards pure-market solutions, deny the existence or relevance of social issues that don't affect white middle class men (i.e. everything but ageism in tech), and gave weight to Eliezer Yudkowsky's Bayesian equation-driven morality, and everything else that looked and sounded scientific (imagine how many old-HN readers would be guzzling Soylent now).

The HN readership had lots in common with LessWrong, but they were diluted and displaced by people who don't share their same, ahem, qualities.