Many professors of philosophy are like religious zealots when they are preaching the gospel according to Marx.  The whole article is argumentum ad hominem,  a logical fallacy in which by he is UNFAIRLY attacking the character or other attributes  of Donald Trump  because he disagrees with Donald Trump.

As for Mr Andrew Sullivan and Professor Kingwell's comment on Donald Trump being mentally ill;  I assume they are alright with Hillary Clinton who with new age psychic Jean Houston, co-director of the Foundation for Mind Research, held séances at the white house to “channel” with the spirit of Eleanor Roosevelt.  She said she  had talks with  Eleanor Roosevelt, Mohandas Gandhi, and even Jesus Christ according to Carl Bernstein.   Former President Clinton has stated she still regularly communicates with Eleanor Roosevelt.  See here.  https://www.youtube.com/watch?v=MRav-34ufcE.  Mrs Clinton's mental stability is definitely suspect if she is  hearing voices and  channeling with the dead.