The evidence would suggest that Trump doesn't understand what he's trying to do.
Well Trump has a team of economic advisors who have told us what he is trying to do. From what they are saying, and what I have gathered on my own, the strategy is this
1. Implement broad-based tariffs with punitive tariffs on some countries, to generate external revenue and
2. Promote domestic manufacturing and production and clean up the supply chain, and
3. temporarily decrease GDP and growth as a way to entice the Federal Reserve to lower interest rates, and
4. push investors into treasuries, thus bringing down bond yields (they have already come down dramatically), which will
5. make government debt servicing far easier (it is at crisis levels right now)
No one has ever attempted anything like this so quickly, and on this scale, and no one knows if it will work.
but why is he doing this at such a degree?
I think there is absolute panic in Washington over our dependence on Chinese imports, and the fragility of our supply-chain. If Xi got mad and completely cut us off, we wouldn't have sufficient medicine, steel, aluminum, rare-earths, etc. --that is a HUGE problem that somehow needs to be solved. I'd like to ask "free-trade" people if they want China controlling all our medicine? How is that a good idea?
and if China gets crazy and moves on Taiwan, Xi could simply tell the president "any interference, and I will cut off all exports to your country, destroying your economy, and putting 30 million Americans out-of-work"
I don't know if any of this is going to work, but I think I know what he is doing. The US went from 40% of global manufacturing to 15% in 40 years.
I am pretty sure my stock portfolio got hit harder than anyone here, so I am not happy about any of this, but it isn't as simple as people think it is