>it's kind of satisfying to see these policies have the opposite of the intended effect

This policy is actually doing exactly what it is suppose to. It is preventing more auto manufacturers from moving operations to Mexico or Canada where labor and Exchange rates are more favorable.

GM, FORD, Toyota, Honda, Chrysler all had their eye on moving more production to Mexico, this new agreement probably stops that.

I don't think anyone thought an auto manufacturer in Mexico would pull up shop and move to the US, that wouldn't make sense.