The world economy is not a zero-sum game. You're making the same mistake that Trump is. Everyone benefits from China, the United States, Europe et al becoming (and staying) rich and prosperous. We should all be concerned.
This is true, but status is always relative to others, and I get the impression that those with more nationalist leanings would prefer a slightly worse off America if China would remain a 3rd world country instead of rising to challenge America on the world stage.
