But generally these kind of threads don't lead to new or interesting discussion on HN so they get shut down. It's not about the story being unimportant, it's just that it (and the discussion it leads to, on both sides) doesn't fit with what the site wants to achieve. I don't think there's any political motive for these stories getting buried (independent of what might motivate an individual flagger)
Now it is the realm of HN
That's not to say I have a better way forward, but I don't think it is good to shutdown difficult conversations to appease the most offended -- that is arguably the group that should have least sway over discussion
But by empowering 'flaggers' and 'downvoters' we give them the most control...
Most news and news sites in general are not about only things that are practically very new, and most articles around even new technologies are reiterating the same information.
HN isn't robot9000. Not everything needs to be wholely original, nor is that HNs purpose - there's pretty clear guidelines around reposting the same article in the guidelines, so why would multiple takes on the same event not be worthy of discussion, to the point of flagging?
I think the OP is clearly worth overriding the flags for, despite the culture war aspect which does lead to crap threads, no doubt about it—though the comments here are mostly good so far, and one even talks about Rider Haggard.