You don't need an enemy for this sort of campaign to make sense. It should be common sense to prefer local products, and even more so to avoid extreme dependencies like the one most of the West has on American tech companies.

In my view, we (Europe) have long been acting foolishly by passively sitting in the back seat and allowing the US to drive for us, thereby creating a radical dependency. This wouldn't be healthy even if the US were the most loyal ally. What Trump's antics are doing is trigger a return to what should have always been the norm.