I agree that this topic could be more accurately and inclusively framed as how to improve outcomes for low income students, or children with absentee/incarcerated parents, or children of addicts.
Unfortunately, some people care much more about racial outcomes than they do about any of those I mentioned.
The point of the racial framing IS to polarize, divide, and mobilize a political base, not to solve an underlying problem.
Talking about helping poor children doesn't get people as riled up, and has the risk of actually leading to agreement and a solution.
American politics has no hindsight and is a zero sum game. If you fix a problem in American politics, you don't get credit for it later. You only get credit for promising to fix problems in the future.
If parties agree and implement a solution, neither party comes out ahead, and even worse, you just made the opposition look more reasonable. It is a prisoners dilemma where cooperation is punished