DEI merely punishes others for crimes they never committed. It helps no one but the race pimps who profit from the misery they sow.Even if DEI were shown to be a cause for quality control being degraded, the reality, history is that if the United States had not embraced ethnic cleansing and slavery early in it's history (an extension of European colonialist thinking) no such thing would have been needed.
Once you have an economy and society where four million black people are not given the same rights as white people, any fool can see that it won't end well.
DEI is an attempt to undo some of the damage but nothing can do that perfectly.