Whilst not making excuses for him, maybe he feels that he can't win with certain people so why bother?
The guy may well be a 'selfish, narcissistic, spiteful, idiotic c**t', as you so succinctly put it, but that's what the USA voted for and that's what they've got to put up with until 2020 (or until he's impeached or the Democrats regain control of one of the Houses). Us complaining on a forum is going to do jack about that.
It's a sad chapter for the USA, but maybe they need to go through this to realise that both sides need each other - that you can't label people rude names because they disagree with you. The wall has already been built - between people who won't talk or compromise their differences and act like adults.
If you want to remove Trump, you have to compromise and listen to the people who backed him - yes, even the racists. You may not like them, but they have a vote and they have a voice and only by convincing them will you change (not by threatening them or calling them deplorables - what has a deplorable got to lose anyway?)
I doubt that much will change anyway, what will be will be.