Except all the issues you just raised are primarily things about which one side cares. The cares of the other are ignored or, in the rare case they are visible, flagged down.
Again, these issues aren't binary, they aren't left v. right, there's much more to understand than just two fixed points. I didn't even dive into any specific issues. Public resources could mean parks or it could mean the Bureau of Land Management, eminent domain or subsidized bus fare. Safety and privacy could be a discussion of the TSA, or gun rights, or immigration, or facial recognition.
Those are obviously concerns that impact a wide group of people, across many different political ideologies.
You are seeing something that isn't there.
Such a comment would be flagged down. A comment taking the opposing point-of-view, even much less politely, would be supported. Comments with vulgarity and rudeness are also tolerated only from certain perspectives. This disparity is particularly galling because low-ranked comments become greyed to the point of un-readability, and flagged ones don't appear at all by default. I couldn't care less about the internet points, but HN ought to leave un-popular opinions visible.