1) National Security and self-reliance of the nation - especially for critical industries.
How are you going to do that without enough access to rare earth minerals from China?
2) Reliable employment for the citizens of the nation, producing for their fellow citizens.
Your people are way more expensive than Chinese labor, are your country man willing to pay loads more for their products?
3) Related to #2 - keeping the wealth of the nation flowing WITHIN its borders - between citizens / local-businesses - vs being siphoned-away via mercantilism.
Any idea how long it will take for a business to relocate operations to a different country?
4) "Financialization" (playing tricks with money) replacing tangible production of goods and services as the driving-force of the nation's economy.
Loads of products you are unable to make in your country.
You as most MAGA people have no clue about economics and running a big business.