I think you're forgetting one very important thing; common sense. In order to use common sense we need feelings and emotions in order to properly judge a situation. The issue is that we cannot teach emotions and feelings to a machine when we don't fully understand emotions and feelings ourselves....and that's not any worse than the current system of human biases creeping into moderation.
With humans it's even worse, as there can be a petty and vindictive nature to it all
i.e. "it can get personal" with human moderation in a way that wouldn't be an issue for an AI form of moderation
AI is little more than an attempt to avoid having to interact with people while still obtaining data from a pool of information that is populated by people. A chain is only as strong as its weakest link.. and AI will never be smarter or better than its creators.