It was not easy for them to agree on the best form of government for the newly liberated nation. They did much research, analysis, and debate to come to the final definition of our Constitutional Republic.
A large portion of the consideration was to the understanding of the failures of other efforts both currently and in history, and how those failures would be prevented.
It would appear that each and every time the Doctrine has been revisited in Congress and/or the FCC, it was because there was significant outrage over biased commentary presented and/or perceived as NEWS.
Although the Cambridge definition of News has nothing in it about fair and balanced or unbiased presentation of the Facts, the Cambridge definition of Commentary clearly includes things like opinion, or biased being involved in the presentation.
Anyone that has studied Journalism in any degree has been exposed to the standards and ethics of the trade. These standards were created and adopted by the Society of Professional Journalists.