It seems to me that real democratic debate means the largest plethora of different opinions. Broadcasters who are chasing ratings are going to be more restrained in their criticisms of corporations or the economic system, or a government, a Conservative government. And since most of the broadcasting industry is privately owned, it would seem to me that you would like to have a critical voice offering an alternative point of view. And maybe it's not 100% objective in the scientific sense, but if you take the industry as a whole, then you have a greater diversity of opinion.
That, I think, is important to consider as well.