Also, taking it to an absurd, think of /r/aww. Would you support having 50% of the stories on there be links to CNN/Fox/MSNBC? There's a line somewhere, and there are multiple ways to address it: have a separate section or site for political news (call it PHN), have specific days or a quota of political news, to try to keep on topic, allow it, but moderate it so it has something to do with the Hacker part of Hacker News, etc. Why not experiment. Even the most HN-addicted of us can probably live without this one part of HN for a week.
Yet, that's the necessary result whenever declawing becomes a topic - /r/aww then becomes not just political, but even very tribal.