Edit: this is a legitimate question. Why is is being downvoted?
Major media sites and journal sites that have a mix of political/ideological content, current affairs, and the occasionally intellectually interesting article, are downweighted but not banned—precisely because we want that occasionally interesting article.
Beyond that, the answer to your question is just plain "randomness". The answer to most questions.
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so...
"Off-Topic: Most stories about politics, or crime, or sports, or celebrities, unless they're evidence of some interesting new phenomenon. "
Farming == BAD is a political topic. As one of the sources in this article says:
“We’ve been studying some of this stuff for decades,” she said. “We already know what needs to be done.”