As I posted above, the decision-making used a theoretical model, where a price increase was calculated that should reduce imports to a level that balances exports to that country, with assumed co-efficients for price-elasticity of imports.
Consider Lesotho: an African country that is probably not known to the decision makers who imposed a 50% reciprocal tariff on it.
In Trump's first speech to the US Congress since returning to power, he said the US will cut aid to Lesotho and that it is an African nation "nobody has ever heard of".
It is a poor country, that probably cannot afford much imports from the US.
It's major export to the US is diamonds, which are pricey.
In my professional career, I often used extreme cases to evaluate proposed solutions, such as reducing the resistance to zero to see if the theory gave a believable result.