There are many past explanations here: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so.... Some good threads to start with might be https://news.ycombinator.com/item?id=21607844 and https://news.ycombinator.com/item?id=22902490. Also https://news.ycombinator.com/item?id=17014869, which shows how far back political discussion goes on HN, as well as the argument about politics on HN.
If anyone still has a question that hasn't been answered there, I'd like to know what it is, and if you know a better way for HN to relate to political topics while fulfilling its mandate of curiosity (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...), I'd really like to know what it is. Just please familiarize yourself with the past material first, because if it's something simple like "just ban politics" or "just allow everything", I've answered many times already why it won't work.