In an otherwise good essay, a couple of things don't ring true:
<There is no evidence that the president harbors racist views.>
Except for a life-time of racist behavior, crowned by a presidential campaign rooted in the racist drivel of birtherism. Is MSW trying to distinguish between racist behavior, which we can observe, and private thoughts, which we cannot know? It's a useless distinction: behind racist rhetoric and behavior there lurks a racist.
<I did not see a man who was acting out of racist instincts. I saw a man acting out of reptilian instincts>
These two sets of  "instincts" - racist and reptilian - are not mutually exclusive; indeed, they are entirely congruent.
<He apparently did not hear the Charlottesville racists chanting, "Jew will not replace us."> 
The only way he did not hear that chant is if he chose not to hear it. Or the guy who said we need a president just like Trump, except one who wouldn't "give his daughter to a Jew."
Trump needs to heed Gore: Resign.