In his letter, he mentions that "it wasn't just Trump who won but the Ku Klux Klan, white nationalists, sexists, racists and buffoons." I and all of my family whom I have spoken to, object to being stereotyped this way. Yes, I am a white man currently from the South, but I'm also a retired service member with two master's degrees... What Mr. Sorkin failed to realize when he stereotyped groups of people... is that his comments put him in the very same groups he so piously condemns.
The media -- all of it, including Fox -- owe the American public an apology, without question. We want news and facts, not liberal bias. Remember: "Just the facts, ma'am."
A more plausible explanation for me is that much of the media coverage was driven by their self interest in promoting coverage of the antics of Mr. Trump during the primaries, with a intentional liberal bias in helping Mr. Trump win the primaries, believing there was no way for him to win the election, especially given the liberal media's estimate that once he was nominated they would adequately be able to intentionally easily sway voters against Mr. Trump in favor of HRC for the election.