In the US, nobody noticed until the US government started employing stronger mercantilist policies, then started complaining about it at home because they don't like that their own government is employing such policies.
That's probably why.
It's worth noting that punitive tariffs, in the end, are taxes on businesses in your own country, because it just raises the price of US businesses doing business (and often gets passed on to consumers, when demand for the product is strong enough to pass the cost on to consumers; otherwise, businesses just suffer and have to start cutting costs in other areas, such as by laying off workers).
Mercantilist policies hurt the local economy as much as they hurt foreign economies. Every act escalating a trade war hurts both sides.