What is important is to understand the sentence as a whole. Advertisers do not want their potential customers to be offended and turn off the program to watch something else. It's in that context that we can understand the phrase in question. The "viewpoints of those from outside the limits of probusiness 'respectability'" would have to be those viewpoints from people who are controversial and likely to offend.Pressure was recurrently brought to bear on the networks to ensure that their viewers, as potential consumers, would not be offended by newcasts presenting the viewpoints of those from outside the limits of probusiness 'respectability.'
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