I take your point but what I've seen often in life is people who are very sharp and clued-in about those areas they work in or care about, but take the word of experts for other things. My own father, for instance, was very smart and successful, BUT wouldn't even consider information on supplements, no matter how well-referenced. He did what his doctor told him to do -- and like most doctors, there was apparently a black hole on the subject of anything Big Pharma or he personally wasn't making money on.

I see a certain similarity in that regard between my Dad and Trump. It honestly wouldn't surprise me if most or all of those few people Trump trusts and interacts with are the same way.