In fact, if you're in the mood to punish yourself, Mary Trump's first book, "Too Much and Never Enough," gives an interesting look into what made him what he is.
The Thanksgiving mashed potatoes incident, his father, Fred (an equally loathsome creature, if not more, believe it or not), and his brother and his death are notable hinge points to what would come.

@MikeBarbre Everything he does that’s reprehensible and/or illegal is always lively, perfect or beautiful. I imagine when you have no conscience, morals or souls, being a dick is a beautiful thing.