There is a lot more to life, and to the sentiment of "America First", than economics. I interpret the MAGA movement as mostly not about economics, but about trying to revert to previous social and cultural norms and values. Sometimes, even acknowledging and accepting the negative economic consequences of that.
For example most Republicans I know, when confronted with the idea that illegal immigrants benefit the economy, still want them deported. The economy is not their primary concern with most issues. Framing Trump's actions always economically misses the point a lot of times.
Moreover, America First is a sentiment of spending our attention and money on our internal problems, like redirecting foreign aid to domestic aid. It's a feeling of, why is Africa getting billions of my tax dollars when I can't buy a house? This is completely unrelated to our foreign business practices except to the extent that we were doing charity for a nebulous status. At least that's what I think people voted for. In practice it has been America burning its goodwill for no reason.
For example most Republicans I know, when confronted with the idea that illegal immigrants benefit the economy, still want them deported. The economy is not their primary concern with most issues. Framing Trump's actions always economically misses the point a lot of times.
Moreover, America First is a sentiment of spending our attention and money on our internal problems, like redirecting foreign aid to domestic aid. It's a feeling of, why is Africa getting billions of my tax dollars when I can't buy a house? This is completely unrelated to our foreign business practices except to the extent that we were doing charity for a nebulous status. At least that's what I think people voted for. In practice it has been America burning its goodwill for no reason.