IMO this way of looking at it is indicative of a lack of respect for candidates, even if communication is superficially respectful. If someone performs badly in an interview then by all means don't hire them, but it's both unkind and irrational to jump to the conclusion that they're a 'clown'. If someone is making such a harsh judgment about 95% of their applicants, on the basis of an interview process which we know to be highly imperfect, then I would not want to work for them.