Generally, they shouldn't want to do this. In specific spaces, however, this makes a lot of sense.
From a more distanced perspective, political discussions are exhausting at best, as you need to discuss many varying aspects influencing a complex system, and harmful at worst, as soon as they turn toxic (which they tend to on some topics). Having a break from these is necessary. That doesn't mean we don't need those - having these discussions is important. But there is a reason politician is a full time job.
Additionally, HN has a very international audience. Internal politics is irrelevant to a large part of the readership - irrespective of the discussed country - and therefore these discussions are simply annoying.