Insulation from consequences of your decisions and distance from ordinary people creates a special kind of stupidity. Nobody with a clue is going to speak up to him, and even if they do few would hold firm when he pushes back. Everything negative he hears will be said in anger or with a sugar coating and there will be plenty of people lining up to assure him it isn’t true. He’s been insulated and if the whistleblowers are correct, he actively fostered his insulation. If he cared he’d read the book about his failures as a leader. But he doesn’t have to care, nobody is going to make him until suddenly he very much does have to care and it’s too late.