If the answer is no then the risk that someone will flag the article increases dramatically. If the discussion environment isn't open and peaceful then how much more likely isn't it that people will just disengage, flag, and then move on.
If however a large portion of comments get flagged or downvoted to the point of being killed, or met with hate rather than polite and constructive discussion, the result becomes a hostile environment. Repeat that experience a few times and many people will stop engaging in the discussion and just use tools like downvote and flag without making a single comment. It becomes a battle ground where moderation tools are a weapon, rather than a forum where moderation is there to improve the quality of those wishing to participate.
There has been a few times where dang has removed the flags of an article but also done some more heavy handed moderation with a seemingly focus on civility and tone. Personally I would also like to see them remove downvoting for those articles, leaving only upvotes as a way for people to appreciate other comments. It is a nice way to give people room to have a serious and open discussion around political topics here on HN, but with some supervision.