but still driving them away because what seemed like constructive argument from one side didn't from the other.

Or still driving them away because the comment stream petered out before people got around to expressing their changed viewpoint and the contrarian left because he never realized he was having an impact. The post and comment format isn't really very good for a serious back-and-forth discussion. Especially when posts are so briefly on the front page, note that this is another good reason for getting meet-up announcements OFF of the discussion page.