I think they are probably the only way of maintaining US dominance in the world, and restoring the balance that has been decimated by capitalism (ie short term thinking).
The problem with the current neo-liberal models is they are all about maximising profits and there is zero strategic element to the thinking.
For example in the steel industry it is all about sourcing the cheapest product possible rather than maintaining a domestic capacity to produce steel. Then when it all goes tits up and a war or unforeseen event comes along that requires locally produced steel the excuses are "no one could possibly have ever forseen this was going to happen".
We had it in PPE for covid. Basically local production has been decimated, so when we needed tons of the stuff we had no capacity to produce it and had to waste billions on procuring stuff rapidly, a lot of which turned out to be sub standard or unsuitable.
The problem is maintaining that strategic element comes at a cost and a cost that short term capitalism is unwilling to pay.
Other countries that are less capitalist take a much longer term approach to business. For example the state will fund strategic businesses that operate at a loss to ensure they maintain control over supply. They will undercut their foreign competitors with state subsidies to decimate their competitors and ensure that when and if a crunch point hits they are in a dominant position.
Tariffs are a weapon against such activities as state subsidies.