I think you have to judge the US arms industry on both of its aims - control and profit. Once you include profit as a driver of military power, I think everything here fits into place. Trump will help US arms manufacturers make profits, his foreign policies will create a need to military might, which will generate commercial activity in one of the worlds biggest businesses, which will continue to fund congress, which will make Trump popular with an awful lot of the people that matter in US politics. As in many things, Trump will generate profits for some of Americas largest institutions, at the expense of a whole lot of wooly and nice concepts like fairness, equality, peace, health, education, whatever. He's the product of an election system and a government system that relies almost entirely on corporate input.