When I revisited Vietnam in recent years, after reporting from the region during the 1970s, I noted how its rulers had won their wars against France and the United States only to lose out on the economic front, as Communism put them a quarter century behind the roaring "tigers" of East Asia. Now they are struggling to catch up by offering their cheap labor to international investors.
Disagreeing with Trump is easy. Often he's wrong, imagining that Americans are incapable of competing with other nations economically. Sometimes his argument is overwhelmed by specific insults and general incivility. Even when he's right, he's usually incapable of nuance. In the case of NATO it's the latter.