I don't know how it is in other cultures but hereabouts unsuccessful candidates can ask for feedback on how they came across at interview, with a view to doing better in future. As an interviewer I don't mind this at all, it takes some guts and if my feedback can help, well then I will.

It can be a bit fraught when people ask why they did not get the job, but there is no other legal answer than there was someone better suited.

Even if I wanted to, I would find it very difficult to hire anyone but the best person for the job - that is often the law and certainly company policy, and there are procedures in place to make sure that this happens and to keep an objective record