Here's what's different between what happened during the Nixon impeachment and Trump's impeachment investigation. During the Watergate investigation and impeachment hearings of Richard Nixon, there were just three sources for anyone to get their news on television, CBS, NBC and ABC. Other than those networks and print journalism, there were no other sources for information about what was going on.
Today, the majority of people are receiving their information from multiple television news channels and cable networks like CNN, MSNBC and FOX. But even more people are receiving information, both legitimate and illegitimate, from sources such as Brietbart News, Infowars, Facebook, Instagram and Twitter and conservative podcasts. These other sources aren't held to the same standards as those public sources giving the news during the Nixon impeachment hearings, not even close. They're sources that depend on subscriber advertising and can easily be manipulated and skewed in favor--or against one person or party. There's absolutely nothing 'fair and balanced' about any of them. Even worse, as we found out in 2015, there's plenty of foreign agents pushing their own agenda and it's not in the best interest of the United States.
This is precisely why watching more than one network is essential to really get a more balanced opinion of what's happening.