Vietnam is a great example of the pointlessness of these "reciprocal" tariffs.
Vietnam's average effective tariff on US imports is 5.1%. But Trump is taking the trade imbalance and calling it a tariff of 90%. But even if Vietnam were to cut all tariffs on US imports it will not erase the trade imbalance. Vietnam is a poor nation with less than a third of the population of the US, but they produce a ton of textiles for dirt cheap. They simply do not need, and cannot afford, to import from the US at a rate comparable to what the US imports from them. Tariffs will never change this fact. The only way to correct this trade imbalance is for Vietnam to stop producing, or for the US to stop buying, the things that Vietnam makes that Americans want to buy.
Assuming that every single trade imbalance is a problem is economically illiterate. An 8th grader could tell you how dumb that concept it.