During a world war, you cannot trade with your international “enemies.”
This level of tariffs is to discourage international dependency and trade as a prelude to war. Look who does not have a tariff.
This is not good policy - leading economists have written about this [1] as “…perhaps the worst economic own goal I have seen in my lifetime.”
[1] https://www.thefp.com/p/tyler-cowen-liberation-day-was-even