Again, I think you are conflating normal people having normal opinions with some kind of conspiracy that simply doesn't exist.
What is "the message"? What are the "viewpoints dangerous to the reputation of their ideologies"?
It also seems weird to directly compare HN, Reddit, and "other forums" as if they are all the same thing. Reddit has hundreds of millions of users and millions of subreddits. HN is probably fairly comparable to a mid-sized subreddit but neither is really that similar to a "classic" web forum.
What is "the message"? What are the "viewpoints dangerous to the reputation of their ideologies"?
It also seems weird to directly compare HN, Reddit, and "other forums" as if they are all the same thing. Reddit has hundreds of millions of users and millions of subreddits. HN is probably fairly comparable to a mid-sized subreddit but neither is really that similar to a "classic" web forum.