How do you watch the news or read a newspaper? everything is presented in such away to convey certain ideas/ points even the selection of written words - exactly how to phrase something to get the best 'impact' perhaps.
Think it's even worse than that. Journalists don't seem to make any attempt not to be biased. Studies or reports that do confirm their bias will get reported, irrespective of the quality of the study or report. Studies that do not confirm their bias get largely ignored. Essentially presenting a twisted view of reality.
And that's before things like the Murray Gell-Mann effect. http://seekerblog.com/2006/01/31/the-murray-gell-mann-amnesia-effect/