The logic of your well-thought out and ponderous argument is utterly overwhelming.
Actually it's a pretty straightforward consequence of the HN guidelines, which clearly do not forbid all political discussion; just "politics for its own sake", i.e. political talk not strongly anchored in some other intrinsically legitimate topic.
That's OK, they're straightforward enough, as they stand. I'm sure you understand the meaning of the quantifier "most" in the second paragraph (as opposed to the word "all" which you seem to be imagining in it place).
On top of this, the moderators (which are very active on high-traffic threads) would have shut down this thread long ago, if they felt it was in contravention of these guidelines (as they quite routinely, in fact).
Might have as well said "Because we can!"