Donald Trump is a tiny little man. He says what stupid people want to hear. He doesn’t care what it destroys.
Donald Trump thinks he is a genius because he inherited a vast amount of wealth and was famous for it. He played the business genius on reality TV, and that is who the stupid people think he is.
Trump thinks it too because he’s pretty stupid. He thought running the country would be as simple as hiring people to flatter him, which is what most of his “business” experience had apparently been like. That and bankruptcies and fucking over contractors and suppliers.