Well, it’s official. The man who was the face of the biggest journalistic botch of the 21st century thinks NBC’s hiring of Ronna McDaniel would “shred” the media’s credibility. Insert your own laughter here. Dan Rather, the face of the “CBS Evening News” from 1981 until 2005 and the face of everything wrong with establishment journalism since time immemorial, trashed the peacock network’s abortive hiring of the former Republican National Committee chair in a Substack post on Monday, titled, “What Were They Thinking?” (For those of you who remember why Dan Rather left the desk of the “CBS Eveni…