There are two semi-plausible arguments for universal tariffs. The first is that the reconstruction of America’s industrial base is the cornerstone of the Godly Society and will make America more powerful and self-sufficient again; in other words, it is an effort at an economy based on import substitution. The second, less broad argument is that a universal tariff is required to keep China from circumventing levies imposed solely on its products by moving the final stages of product assembly to other countries. In this argument, the universal tariff is a regrettable necessity, not a positive good. Does either hold water?
As I’ve explained before, attempts at autarky inevitably lead to inflation, inefficiency, and uncompetitive businesses. The second argument basically suggests that it is OK to increase the costs of a vast number of imports that have no connection with China in order to hit the ones that do. That is using a sledgehammer to crack a walnut.