Here are the options for economic inequality between 2 trading nations long term. These are from the perspective of the wealthy country that has outsourced their production into a trade deficit with a poorer country.

A: You can let them get rich as a result of their hard work until there is no longer an incentive to outsource because your economies have hit parity.

B: Tariffs will nuke your own economy down to whatever level the other economy is at so there is no longer any incentive to outsource because your economies have hit parity.

The only possible reasons I see for choosing B.

1. Xemophobia and or racism causing you to to oppose the other economy succeeding.

2. Tariffs give government coffers a bigger piece of the money pie that can be used to fund more corruption that you and your buddies can pocket.