a) we should not abandon the general rules, unless under the most exceptional circumstances [ ie. unless these posts threaten to kill the HN site or render it unusable in the main, we should not adopt a special rule ]
b) its un-needed, in the sense we can choose to self impose this by not upvoting overly political stories/comments
c) HN is already practicing too much self-censorship - we need to tolerate some extremes / ugly points of view, in order to keep a healthy community where free speech is highly valued and where any subject can be discussed
d) imo HN is equally susceptible to hostile takeover by ugly "trumpism"'s as it is by political-correctness / overly tolerant relativism. It is for each of us to upvote/downvote/comment in order to fight against memes that might enslave this community and its freedoms.