I agree with your use of 'downvoting' to remove content personally but less so the correlation to 'upvoting'. Just because there's an up button and a down butt

I agree with your use of 'downvoting' to remove content personally but less so the correlation to 'upvoting'. Just because there's an up button and a down button close together, and clearly the intent that they are correlated, doesn't mean that the usage in practice is the same. A vote up means that the post is on topic, and relevant of showing to others preferentially in the eyes of the voter. A vote down is often used on topics that the voter simply /disagrees/ with, irrespective of relevance to the topic. Therefore I would propose that 'mixed votes' indicate a contentious, but likely on topic, point of discussion for further discourse and refinement. There should clearly be a threshold (a large number of votes, with a vast majority of them negative) for indicating actually harmful content.