The US is not trying to bring back t-shirt manufacturing. That part of your reply is spot on. Triffins Dilemma is part of the issue, but so is the mountain of debt the US is currently trying to service (not unique to US).

Trump and Company are going to continue devaluing the dollar to make servicing the debt more manageable.

They know exactly what they are doing. It is not incompetence as you insinuated.