On the other hand, no single political or ideological position has a monopoly on intellectual curiosity either—so by the same principle, HN can't be moderated for political or ideological position.
It's tricky because working this way conflicts with how everyone's mind works. When people see a politically charged post X that they don't like, or when they see a politically charged post Y that they do like, but which we've moderated, it's basically irresistible to jump to the conclusion "the mods are biased". This is because what we see in the first place is conditioned by our preferences - we're more likely to notice and to put weight on things we dislike (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...). People with opposite preferences notice opposite data points and therefore "see" opposite biases. It's the same mechanism either way.
In reality, we're just trying to solve an optimization problem: how can you operate a public internet forum to maximize intellectual curiosity? That's basically it. It's not so easy to solve though.