> Instead, we are seeing countries match with import tariffs in the other direction, and a deterioration of global trust.

Right, because e.g. if Canada has no tariff on car imports and the USA has tariffs, then the logical course of action for car manufacturers is to move all of their manufacturing for Canadian-sold cars to the US, because it's more flexible to have manufacturing in the place that incurs fewer tariffs overall. Canadian import tariffs take that incentive away.

Export tariffs make more sense for resources where the manufacturing base can't be moved.