Moderation helps weed out the spamming, trolling, and general trash-posting that can quickly crowd out any real discussion. That stuff lowers the value of the

Moderation helps weed out the spamming, trolling, and general trash-posting that can quickly crowd out any real discussion. That stuff lowers the value of the site for anyone other than the basement-dwellers, and therefore lowers the value of the site as an advertising platform. The only reason the site owners would care about the KKK is in terms of whether they increase or decrease the total number of clicks.