…this has always bothered me. How can they be Mainstream, if indeed - nobody Watches or reads 'em?

Answer:
The same people who watch Oprah and the View.
Answer:
They’ve been the mainstream since there were only three stations to watch for news. Everyone had only three sources and they were and are still mostly the same they state the same thing mainly in different ways of wording it. If you ever watched the Green Barret with John Wayne. In it one the actors states that you could fill volumes of what the media doesn't tell you.
Answer:
Because it's an internal contradiction and depends on who does the defiling.
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easily.. hitler was mainstream too
Answer:
MSM-bashing is just a tool used by people who do not agree with facts and reality.