Just my opinion, but it seems like each and every outbound link is getting deleted. The rules say; but I've seen links to BBC news articles and wikipedia pages all get deleted. These are obviously not commercial spam-like links, and also clearly were added because the discussion was on those topics. The web works because of links - why are you suppressing them so much? If I was being cynical, I'd say it seems to be for SEO reasons, but reduced google ranking due to outbound links is a fairly outdated idea now, so I hope I'm wrong on that.