"Deplorables" is a key moment because it neatly encapsulates Hillary's negatives: she is vicious, elitist, dishonest, divisive, lacks self-control, and holds ordinary Americans in contempt.
Very good summary. It also reveals her narcissism. I suspect she thought "basket of deplorables" was a clever phrase that would win her praise, at least from her supporters. Obviously, that did not work out as she intended in the general population.