If plants are in America, it is Americans doing the work and earning the wages. Americans are also spending their hard earned wages in the US. Many, if not most of the components come from US companies. The steel comes from US steel mills. Further, the plant owners are paying lots of taxes.
Why did BMW, Kia, and Mercedes come to the US to build cars? Because the US has highly skilled and educated labor. It is also a lot cheaper to build in the US for the US market. Additionally, IIRC, the US is THE country where ALL of their SUVs are built and then exported (forget the company).
Folks who aren’t buying Big3 are showing them tough love. If you build substandard products, tough, we aren’t buying them. Fortunately, the Big3 have been doing a lot to get their act together and many new models are looking good.
Check out who supplies Nissan, Honda, Toyota in their USA plants. More often the suppliers are Japanese owned companies who have set up branch operations. Since you claim to be into "tough love" you should try and track it down and be shocked. I have looked at it myself but you think Toyota will ever publish a compressive breakdown of who supplies them and in what volume and what dollar volume ???
*******Above is one example of a Japanese supplier who set up factories here to cater to Toyota, Honda, Nissan in the 1980s