Hanlon's Razor says "Never attribute to malice that which is adequately explained by stupidity."
I think things have gone past the point of simple stupidity.
Another way of looking at DEI is that it deliberately builds stupidity/incompetence into the system. That sort of happens when competence is not at the top of the list. After a while, DEI hires are hiring more DEI hires so the 2nd, 3rd, and 4th generation DEI hires are far worse than the first. There most certainly are some competent people hired under DEI rules, but odds are they won't be the ones getting promoted or doing the hiring in the future.