Not only their peasants, but their gang members and garbage-picking indigents. There's no argument that getting rid of them probably did make Mexico better. The trouble is, that strategy is a zero sum game, with the US at the losing end of the deal.
And the neat little trick is if “White America” complains about their trash being dumped here, Mejico can call us a bunch of “racists” (nevermind it’s the White elites in Mejico (Fox) doing the dumping AND the name-calling).