>incoherency of the people in that thread acknowledging pervasiveness of politics and then trying to exclude politics from discussions hereIt's not "incoherent" at all and by using that label, you're falling into the same trap as JM using the label "ostrich mentality".
Imagine a political science professor that lived and breathed "politics" all the time such that he teaches classrooms, writes books, and sits on panels debating various policies with others. Now, imagine a friend's mother invites him to Thanksgiving dinner. It is suggested that politics not be discussed. Yes, the professor could be impossibly obstinate about it and say, "that's delusional -- there are politics in the production of that turkey, the food lobby, the creation of the Federal Holidays, etc. Politics is embedded in _everything_!"
However, the professor doesn't have to be that inflexible. He can avoid politics talk during that dinner and the very next day, sit on a panel with Noam Chomsky and Christopher Hitchens and debate every political hot button topic under the sun.
Turning off-and-on the political discourse switch for certain venues is not "ostrich mentality" nor "incoherent". Perhaps there's a different reason that some people don't want politics on HN: the political comments are low quality.
Likewise, the mother isn't delusional/incoherent in thinking that politics doesn't exist everywhere. She's just attempting to set the tone for a pleasant agreeable evening.