Just like China did? They had a whole phase of economic liberalization and opening trade.
>Nothing prevents anyone from making moves 20 years from now that are bad.
Vietnam is literally another communist pseudo-dictatorship. Their place in the world is obviously far more ambiguous than that of e.g. England. The idea of shifting manufacturing to Vietnam because you do not like the positions of China is just absurd.
>All we can do today is encourage those who seem to be moving for the better.
Why should the US not focus on supporting long term allies who aren't communist single party states?