In the view you've put forward, you say that politics is the problem, a topic that when discussed causes fights and it can damage the culture of HN. I disagree. If we don't know how to talk about politics with strangers, we stop trying to persuade each other, and we bottle up our disagreement, and we go online and yell at someone else, or we vote for the candidate who screams our view... because we don't know how else to express it, to find the nuance in it, and ask ourselves hard questions. We'd rather have an opinion than not stand for something. All of the flaming is a way of expressing it...
We can suppress the conversations on HN to focus only on specific science or technology, but on a technology website in this age, and right now that seems like we'd be the website equivalent of a child covering their ears when they don't want to hear something. Blockchain tech, cryto, AI, mesh networking, job loss from automation, cyberwar, Quantum C. Seems incorrect to suggest that technology and politics can be separated easily (especially at a big picture).
Of course this is the internet, people come here to troll and fight. But we as individuals can always walk away. We can douse the flames by not engaging in it ourselves. We can always handle a conversation with care, it's not the topic that is emotional, it's us. It isn't up to the community to stop people from talking about touchy subjects, so that we all get along, it's up to us to learn how to talk about these things better. On the net, just like in the world.
The experiment shouldn't be to stop political discourse, but encourage it. See where we go, go forth and be critical thinkers and talk about the hardest topics facing human civ right now. Lets see what happens. Maybe that is naive, but we gotta start somewhere. Discouraging the conversation isn't a start, its an end.