1. The "good old boy" theory. That is basically #1 above with a better name. But it doesn't explain how they got there in the first place. (Hint: People reveal a lot about themselves in their accusations of others.)
2. The Billy Jack theory. This examines the historcal positions of left and right. Leftists have not always controlled academia and the media. Many of them used to be outsiders against "the establishment." Outsiders strategize while insiders defend. Unless the insiders recognize the threat, they are at a huge disadvantage. Outsiders understand the importance of controlling information. Insiders take it for granted.
3. The "I am smarter than the sum total of everyone who lived before me theory." They are out to prove this no matter how Picasso their logic becomes. Things do not have to balance, make sense, or line up. The world begins with them and all things are to be redefined by them. They also think they are smarter than God, and the world is just dang lucky they came along.