Sure Americans and most everyone else will buy according to the theoretical expectations even to the detriment of their own economy and ergo, its population... so what might underlay support for that condition in the US? Could it be the methodology that in the near term we suffer but in the long term we all... the planet... reach equilibrium and when that situation is achieved we'll not war, we'll obviate poverty, and on and on...
Look at this way.
Person A and Person B, similar income, go shopping and both need to buy the same things to survive.
Person A buys made in US products if there is a choice between US/foreign product (or if you want to branch it only made in their homeland) while Person B buys whatever product offer's the best price/quality, regardless of where it is produced.
Person A spends $150. Person B spends $100.
Person B is now $50 richer than person A, since it spend $50 less to obtain the same products.
Some people will say "Oh but person A is helping US economy, while person B is being selfish".
And at this point most people stop thinking, feeling satisfied that person A is the better human being. But is it?
It isn't the end of the story.
With those extra $50 person B now can do stuff person A cant.
Maybe person B will buy some cheese, maybe it will go to the cinema or have a meal, maybe it will buy some made in US t-shirt, save it to buy a new phone, save it for kids education, etc.
If everyone was like person A all those other products and jobs in which all person B spend will suffer.
It is easy to see the jobs person A help saving but it is harder to see the jobs person B is creating by choosing the best price/quality products.
As we can see, person B not only is helping creating efficient competitive jobs but it is also having a higher quality of life.
"Ah" you say "there isn't enough products/services/categories where US products are the most efficient!".
And that is who's fault? The person that is simply trying to have the best possible life?
Why is it that in several categories US isn't competitive? And is it only because of wages? Or are there other barriers to competitiveness?
Because despite wages there areas where US is competitive.
Why isn't US making part of the stuff it imports? How can it be cheaper to produce abroad and then import it if US has a trade deficit? How can US import European goods and then it is cheaper for Europeans to fly over US and buy them instead of buying them directly in Europe?