Vietnam is making moves in directions I want to encourage. Only God knows the future and he isn't talking. (there are some who will disagree with various parts of that statement, but they have offered no evidence that they get useful information on the future.

Vietnam has been at war with China in the recent past. Today China is claiming seas that the US and internal law both call Vietnam's territorial waters - though currently they are not at war. Thus even if Vietnam doesn't move in a good direction, just keeping them where they are (as opposed to supporting China) is useful if only because all indications today are China will start a war in the future. (again nobody knows if they will, but they are preparing as if they will)

Nothing prevents anyone from making moves 20 years from now that are bad. All we can do today is encourage those who seem to be moving for the better. We have no clue how things will turn out. Even when we make what in hindsight now looks like a bad decision, we have no idea how it would have been if we had done something different.