If the selection and supervision of one's subordinates is the most important responsibility of anyone who manages other people, then admitting that one has failed at this can be a career killer. When this failure takes place in the healthcare industry, or the military, or any other organization that deals in life and death, the stakes are the highest, but it still cuts both ways and people die because someone hired or promoted the wrong person, but won't admit it and do something about it.

If you change the culture so that this responsibility is taken seriously enough to invite and respect admission of failure, rather than punishing it, you change the results.

But don't hold your breath, or pay any attention to internal politics, PR, or propaganda until you see it happen in a great big important example.