Oh, good grief!
As I have said repeatedly, I don't like Trump, I wish he hadn't been nominated, and I have serious concerns about his ability to handle what's coming. But - damnit, he was elected, he is the President-elect and we need to, at the very least, quit with the amateur pschologizing and doom-mongering.
He said a stupid and crass thing about his daughter. As a narcissist it makes sense - everything is about him, including his daughter and it is obviously important to his ego that he produce attractive daughters. Sometimes a cigar is just a cigar and to keep beating the incest drum unrelentingly says more about the drum beater than it does Trump. Give it up for Pete's sake.
You or I would never say that kind of objectifying thing about our daughters, but we're not a NE middle of the road leftist narcissist somewhat successful business person either, so we probably do a lot of things differently.