The thing is, HN doesn't just contain links for the intellectually curious. It often has stories about a new school of thought, or an approach to design, or a new programming language or something. However, it also often has stories about Internet Drama in the tech startup community, or American political events, or practical advice for people entering the business world for the first time. They're popular here because they're relevant to a large proportion of the HN user-base, but it's certainly possible for someone to be both intellectually curious and uninterested in American politics.