Diversity is good when it is either applied in a neutral and identify-agnostic way, or if we as a society all agree on which groups deserve getting benefits and which ones don't.

The first one is sadly horrible disliked and tend to lose support as soon the "wrong" demographic get benefits. If you have a diversity program to benefit minority X, and then later X become majority, then the program get canceled rather than applied for any new minority. The programs always get designed with a specific target in mind.

Similar for the second, if a group get popular support, diversity programs will help those while ignore any similar but disliked group. The program is not there to fix diversity, it is to help the intended group. When the political environment becomes polarized, it becomes very clear which groups get support from which side.

It has been very clear by diversity programs, and those who oppose diversity programs, that no one want a difference in perspectives, or for that matter catching their own blind spots.