I think, and, well, here's a phrase I've never used before, that may be slightly unfair on Trump. Trump does actually take 'expert' advice; he's just astonishingly bad at choosing experts (witness the amazingly weird lawyers he surrounds himself with). But he does seem to at some level realise that he doesn't know everything.
I think it's because not many non-wierd folks want to work for him. If he were just 5% better at supporting those who work for him, he might increase his success rate by 50%.
having worked in his general vicinity briefly, I can attest he doesn't take any advice unless it's pushed on him. His PR people, at least, seem to be constantly manhandling/damage-controlling the man
