Past efforts to do that kind of thing haven't worked, so I'm a bit down on the idea. What ends up happening is (1) the meta communication stirs up a flurry of objections, some relevant and many not; as well as people passionately restating what they feel about current affairs and/or how much they dislike what some other comment said; and at the same time (2) most people still don't see it, so it ends up not having the desired effect and just taking a ton of time.

Somehow, no matter how often we repeat something, the set of users who hear it always has measure zero (https://news.ycombinator.com/item?id=25787443). That's why I mostly stick to answering specific comments with detailed explanations, and hope that at least some other users will see it.