How rude should a book critic be?

In questi giorni sulla stampa americana e inglese si parla molto del mestiere del recensore. Ecco quel che dice Caleb Crain, "A non-question has recently preoccupied the literary corners of the Internet: How rude should a book critic be? I call it a non-question because its non-answer is the same as for people in social situations generally: it depends. ... Is it possible to shift the question toward ethics? What if we ask: How free should a critic be? ... Maybe we haven’t correctly identified yet the critic’s essential function, and the disagreement will vanish once we do. So let’s alter the question again: How is a critic free? Along what axis, if any, is a critic allowed complete freedom? theparisreview.