That thread has been flagged, despite being clearly a reputable source and in scope for 'hacker news'.
There seems to be a cabal of down-voters to take politically undesirable stories off the HN homepage. For instance, a while ago there was a story called 'The Myth of the Lone Wolf Terrorist.' I read it, then when I clicked back to HN to look at the comments, there was no sign of it.
Happens far too commonly. I'll see a great link in the RSS feed and come to look for discussion about it after reading, but the article will have been removed. I've learned to search site:ycombinator.com with the article's title in order to track it down and see if there was any discussion before it was binned.
