The theory behind DEI policies is to formally challenge personal bias (both explicit and subconscious) in hiring and participation. There’s nothing inherently tied to unfairly favoring minority groups other than the fact that they are usually the target of negative bias.

It’s a pretty basic and logical idea that acknowledges human fallibility. I hate that it was rapidly co-opted on all sides as a shorthand for racism and opposition to cis-white-male dominance.