I have no objection to Mexico closing its southern border and otherwise pursuing its own self-interest. The problem is that while they rightly object to Guatemala and other Central American countries dumping their human dregs on the Mexican side of the border, Mexico insists on its right to dump its dregs across our border. A bigger problem still is that our elected "leaders" in both parties are more than happy to oblige them.
This is a good point actually. A lot of the drug gangs are actually El Salvadorian, not Mexican. A secure Mexico makes the US more secure; I just don’t think leadership in either country is willing to do what it takes.