I don't know if he cares about them per se --- but a lot of American businesses are also down there in Mexico --- and many thanks to NAFTA. They're goal is to get rich --- not make Mexico more stable which those low-paying jobs bringing them all up to the border aren't doing obviously. Someone would stand to lose a lot of money if Mexico goes into it's next revolution. It's not about changing the underlying conditions --- but about holding it off for as long as possible.
The last thing anyone in power wants to see is a change in how Mexico operates. Unless it means more US dollars flowing into Mexico.