The way this sounds is that you are more concerned about politics as in people who take party positions and may feel excluded as a group when the majority of the community takes a different position. This is a slightly different issue i.e. party politics, and I think it is fine/a good thing, but it is also important to distinguish the two. This should essentially be under the same umbrella as personal attacks, as they are essentially the same thing.
I'd rather see HN go politics-free forever. Political discussions do not enjoy the same level of objectivity that technical and business discussions do. Frankly, it may be impossible to expect objectivity within political discussion because our political feelings are so deeply-held and tied to our individual upbringings, culture, and locale.
Unless HN can figure out how to give fair treatment to minority opinions, it's best to exclude these discussions entirely.
Given that cultural and political values and assertions are diverse within relatively small communities, never mind a global audience, I'd suggest this would be very difficult to pull off.
For a moment, consider speaking about a topic that was settled decades or centuries ago in your community, but is still a controversial topic elsewhere. What topic are you thinking of? What other communit(y/ies) were you thinking of? What issues and communities do you think other people would offer? I bet there would be a lot of different perspectives on these questions, which is the reason political discussion should be limited.