HN could remove this disagreement moderation bias by implementing a meta-moderation feature similar to Slashdot. Slashdot used to be a great place (like HN was

HN could remove this disagreement moderation bias by implementing a meta-moderation feature similar to Slashdot. Slashdot used to be a great place (like HN was a few years ago), and many of the best moderation systems originated there. Meta-moderation kept everything fair because you could moderate the moderators. The way it worked was that people with high karma would get asked at the top of their page to please take time and meta-moderate 10 comments a day. You get presented with 10 random comments and the moderation +/-, and simply check a radio button indicating whether the moderation was fair or unfair. The way it was enforced, I assume, is that people who were meta-moderated as unfair too often would lose their ability to moderate completely.