It's a competitive job market. Why are you talking only about Mexico? You probably forgot about the refineries? They will close as well. What to do? In addition to these places come the Japanese.In the end, not just jobs and capital leaving America.
Competitive job market is OK. I don't have any issues with Americans importing cars from Japan. The Japanese technology is one of the best and they pay their workers above average wages. On the other hand, the Mexicans are able to manufacture cheap cars, using slave labor. And in addition to that, the quality is not that good.