It is neither desirable nor possible to exclude political topics from HN completely. At the same time, it's important that the site be protected from being overrun and dominated by political topics. Lots of explanation of how we handle this can be found at these links, if anyone wants more: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so....
* here's pg making the same point 10 years ago - https://news.ycombinator.com/item?id=4922426