He wants to devalue the USD to make manufacturing more cost effective. For that he needs leverage. Plus tariffs raise money so can fund tax breaks. Read the essay I linked to in my other comment. It's all there.
You completely avoided interacting with the concerns I have in good faith. I understand that's the marketing pitch, I even understand there is some truth to it, but can you try to see the bigger picture and zoom out of an individual policy to see overall strategy? At the absolute best this is incompetence.
Even if we figured out manufacturing, wars are frequently won with technology, and those researches that fled Germany to get away from oppression are now fleeing America because colleges are robbing them of their dignity in expression and attempting to exploit them by taking the fruits of their labor, without the experiencing the "cost" of their own person-hood and individual beliefs.
Who buys American weaponry to fund American military industry when countries don't trust us?
Why would he create the grounds for civil unrest here, which would make decisive military action much harder?
How can we have leverage when other countries are dealing with an O(1) problem while we are dealing with O(N) harm to our economy?
Why abandon Ukraine, a country in a very similar position to Taiwan?
Why talk about ethnically cleansing Gaza, ceding the human rights high ground?