On her show, Nancy Grace is not acting as an Officer of the Court.
I explained why such lies are told. It's to improve ratings and make money. They know the vast majority of the public remembers headlines far moreso than anything else. And they also know that the vast majority of the public will not do their own research (or thinking). We live in a culture that features fast foods and jumps to conclusions. Shows like Nancy Grace's take advantage of our culture.
But for balance you can always tune to Geraldo who will give the Official Defense point of view each time, in equally sensational a manner and with much less accuracy. He also has a huge audience, so they will be impacted and 'taken advantage' of also.