Sometimes, of course, the prospective candidate really has no skills at all in the required areas. I'm reminded of the Tom Lehrer quotation:
" ... one of the many fine things one has to admit
is the way that the army has carried the American
democratic ideal to its logical conclusion in the
sense that not only do they prohibit discrimination
on the grounds of race, creed, and color, but also
on the grounds of ability. "
But I'd love to tell people why they were unsuccessful. I'd love to give them the opportunity to learn, to grow, to improve, or in some cases simply to say "Well, I guess we weren't a good fit."However, the age of litigation prevents me from doing that. And I'm not allowed to say "Sorry" either, because that could be taken as an admission of culpability.
(edited to add the Lehrer quotation)