First gen students at elite universities (including Emory) favor elimination of legacy preferences

Because they believe it’s in their best interest. You may agree or disagree but that’s why they do.

You seem awfully exercised about this. Do you fundamentally believe that legacy preferences give a tip to people who otherwise aren’t qualified for admissions? By and large, I don’t. While I would agree for developmental admits, I also understand that developmental admits by their very nature are anomalous enough that they don’t really matter.

You are conflating two things–legacy preferences which are usually a minor tip (at my alma mater, they are clear that it only helps if you are willing to apply ED) and developmental admits who often appear like a quid pro quo (BTW: I’m okay with this as only a moronic college president would bite the hand of a large donor).