The reason Trump is using tariffs is to cause foreign countries, that have been giving us the tariff shaft, to lower their tariffs.
He figures when you have a massive trade imbalance the one with the deficit usually does better than the one with the surplus.
Bunch of countries prevent competition from the US by instituting tariffs to freeze American manufacturers out of their market.
Trump is just doing the same thing they've been doing to us.
Since we're the biggest economy in the world, and we aren't buying as much of their products anymore, they end up suffering more than us.
Oh, BTW, the only thing government does to business is get in their way.