‘When a writer writes a book on a certain event or phenomenon; he is not just airing his opinion but judging it.’
Journalists have the privilege to access information that is often not available easily or is not completely in the public domain. This privilege of the journalists often makes them to be better at psephology not just in predicting the election results but also what the people of a country or geography are thinking or where the tide is headed to. For this ability is also very conditional. To have a clear view one needs to have little or no prejudice and should not be furthering a specific goal or agenda. Prejudiced writers often focused on certain specific issues more while ignoring a large part of the event or phenomenon to prove their theory. When a journalist turned writer has prejudices or agenda to further, it is reflected in her/his writings. Their skill and magic with the words opens the slits wide.
The criticism of any phenomenon or event along with the detailing is necessary to judge the relevance and importance of that phenomenon or the event and help the future generations to make proper amendments so that the positive values created by the phenomenon or the event is gracefully put forth while the negative values are criticized so those who pursue or follow such goals have some ideas about how to navigate or opine and none commits the same mistakes which had been committed earlier. Such criticism helps in building a better society; so the nation. So it's a very important task at the hand of the critic at her/his disposal.