Yes, I am a relatively new commenter (24 days). I started following comments at a particularly heated time. And the community aspects of the site are very interesting to me, in traction between users, community policing, the behavior of the moderators, how people choose to trust some sources and distrust others, how people who disagree can constructively discuss the contentious points. This last is particularly important to me, especially given the polarized political climate in the US.
I'm not prepared to weigh in on whether or to what extent there's user bias as to which stories or comments are getting flagged or down voted. I think it's a worthwhile question that should be examined analytically, with more than anecdotes.
Also, I don't know how the flamewar detection algorithms work, which causes some submissions to be removed from appearing on the front page. And based on what I've seen of the moderators, I give HN the benefit of the doubt that this system doesn't specifically include a political bias.
As for "moderation downweight", do you have some links for discussion on this feature?
Personally, I see no evidence that the moderators are actively biasing discussion other than trying to keep things civil and substantive. As for user flags and down votes, those are reflective of the community, and I say that without judging whether it's the correct behavior or not. Communities play a role in shaping themselves. How that shaping occurs is also up for discussion.
As for changes in flagging aggressiveness, I think people here in general want to be tolerant (explaining the early political/election topics) and have been getting increasingly tired of seeing the same topics getting rehashed (explaining the more aggressive flagging of political topics now).
Anyway, I am new so maybe this is all crap :) Thanks for taking the time for reading to this point. What do you think? Fair analysis? Bunk?