Good Fences Make Good Neighbors

It came to my attention recently on the evening news that cheap-ish gas from Mexico is not allowed to cross the border into this country. How's that again?! Like this: An American couple went and filled up their gas guzzler and its extra tank with less expensive gas on the other side of the border. On their way back north they were denied exit from Mexico with all that *cheap* gas in their truck.

Ok. They have rules. And here's my question: How come Mexican nationals, both legal and illegal, are welcomed into this country to work for the express purpose of exporting US $$$$$ into Mexico? Why is that allowed? Not only is there no repercussion whatsoever from this government, but they are tacitly, and maybe not so tacitly, encouraged by their own government in a ploy to foist off its own financial burden for its own citizens onto the responsibility of the US taxpayer.

Sooooo... Can somebody explain how this *good neighbor* policy works again?