I don't believe it's possible to be unbiased - whether as a news site or as a moderation filter. It's better to be aware of your biases than to fool yourself into believing they don't exist.
I agree with this. I'd like to see an AI that detects which biases a person has. The biases could be associated with short tags which could be displayed to commenters in a UI to make people aware of the biases they have.
