Here's my libertarian perspective, because nobody asked for it:
The US is issuing RETALIATORY TARIFFS because other countries were already using them against us.
If we lived in a world with a "perfect" free market, tariffs would not be good. But we don't, and we are already under threat from outside countries who use slave labor to compete unfairly with us and flood our markets with junk.
Tariffs are one of a few great tools a state can use to protect the economy of its people without just flushing them with cash Saudi Arabia style.
I literally could not give a fuck about the stock market or 401ks because I do not own any stock and I do not have a 401k. Most people in the US also do not, only a small minority of people own stock. I buy tangible assets. I buy local. I buy American.
Make anything you don't want to buy, or at the very least, make it last. I am a staunch capitalist, but that doesn't make me a consumerist retard slob like most western Commies are in today's day and age..