With that being said, the moderation here is very excellent and generally keeps the quality of discussion somewhat high, so I agree with your central thesis.
I also understand that this isn't my site, and that I have no control over the behavior of others on this site. I'm just putting that out there.
A good trick is to go to the comment history, and search until you find the last streak of not dead comments. It's fine to vouch the [dead] comments (if they are fine), and enough vouch unkill the comment. In the case of bopbeepboop it looks like many of the comments were vouched.
How does one do that? Haven't seen any option to do that.
In actuality, even factual and cited posts will get you shadowbanned if your opinion is contrary to the mainstream (on HN) narrative.
I think it’s more “conforming” than “constructive”.
If you post/comment in a certain manner you get upvoted and break into the potential downvoters. Otherwise, you stay in purgatory of the middlings.
There is an echo chamber here based on how the downvote rules work, and I've watched people's comments get brigade downvoted in minutes for posting a well written post like yours which goes against what all the "cool kids" think. And unless you run at the mouth to become "liked", you don't get the chance to disagree with your own downvote.