Well if it is all about race, then:
1. 72% still beats 28% and the issue is why some whites do not vote on racial lines IF EVERYONE ELSE IS DOING SO.
2. In a two party system, you have to vote for someone. The interest of black, particularly working class blacks, and hispanics who want easier immigration conflict. So the GOP must pick off the groups they can.
Yes, I used to wonder about that, too.
The best answer is that there is a war between two groups of whites (them and us), and that THEY feel superior to us and entitled to rule over us because of how much they do for minorities (or do to them, it's often the same thing).
In the mental universe of THEM, only whites have moral agency - good or bad, the minorities are just insensate lumps of carbon to be acted upon by virtuous whites or done dirt by evil whites (a/k/a us).
The key to understanding is that IT DOES NOT MATTER whether the things that are done for minorities, or to them, by virtuous whites are any good, nor does it matter what the outcome of what WE want is - the results are of no importance. It's the DOING of things that makes this white subculture virtuous.
Our futile protests that the things they are doing (AA, welfare, crime tolerance) are BAD for minorities only lower us further in their eyes, BECAUSE THEY DON'T SEE MINORITIES AS REAL PEOPLE, only as objects of their compassion.
Anyway, that's the answer to your question. No charge.