Journalists in press conferences generally already know the answer to the questions they ask. They are either asking so expose what they consider unsuitable behaviour or so that viewers can see what is going on in their name. I use the word behaviour in its broadest possible sense. Personally I like journalists who hold officials to account, eg Peston, Crace, Peck, Keunsberg, but not the likes of Janet street Porter who just spout their own opinions.