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.
There are a ton of other sites where you can follow and debate politics all you want.
I'm starting to stick my nose into local politics here in Bend, Oregon, but there's no reason I need to talk about it on HN. I'm ok with compartmentalizing things: HN for tech/startups/'interesting things', and other sites for other things. I love bike racing, too, and feel that it's the best sport in the world, but I see no need to introduce bike racing articles here.