Earlier quoted context omitted.
The "trial by media" point is a fairly common one, insofar as media can influence the public's perception of any activities before any legal wrongdoing is established. I.e. in the UK, Cameron is on the front pages for his father's activities, regardless of whether he had any part/they're genuine/benefited etc... "Trial by media" is less a witch hunt, and more influencing the zeitgeist.
I am not sure what you mean by "trial by media" being a common point. Common where and used by whom? I am also not sure what you mean. Are you taking the view that "influencing the zeitgeist" should only happen in the court system?
Not saying that it should only happen in the court system, just saying that since the media has the widespread ability to do so, they need to hold themselves to a certain account and be satisfied that their definition of "in the public interest" is worthy enough.