Power of the press?

Innocent until proven guilty - isn't that the way it's supposed to work?  So several stories in the news which call this fundamental principle into question.  Fred Goodwin loses his knighthood despite not having been convicted - or even accused - of any wrongdoing.  John Terry has at least been accused of a criminal offence, but not yet come to trial, and yet despite this, there are calls for him to be stripped of the captaincy of the English football team.  And then there is the suggestion that, if he is charged over a motoring offence, Chris Huhne should lose his ministerial post. What's the logic here - or isn't there any?  Are these just examples of the media stirring things up in the hope of boosting circulation?  I hope Lord Leveson is taking note.