You can see this in a lot of topic related subreddits, if something is extremely popular, you'll get downvoted for calling out any faults. Eventually people just stop posting.
It's not just downvoting, though. Reddit also lets the moderators act like real censors and they are completely unaccountable. There is no way to visit a subreddit and know whether the discussion there is censored or not. So you have to assume it is.
At this point, the only reason I still hold a (read only) Reddit account is so I can turn implicit censorship like thresholding and front page blocks off. HN, unlike reddit, still has value as a discussion medium, but I wish that "showdead" didn't make the posts unreadable.
Here you go: https://openuserjs.org/scripts/kennethrapp/Hacker_News_Text_...
var downvoted = document.querySelectorAll('.comment > span:not(.c00)');
for(let i = 0, c = downvoted.length; i < c; i++)
{
downvoted[i].style.color = '#70798C';
}