Blamin' the Yanks

Ross has produced a handy Q&A on Mexican Swine 'Flu, which includes this:

Mexico is right next door to the United States, is there any means by which we can blame America for the crisis? Not yet but researchers are investigating various possibilities.

Tim W reports that The Graun made a half-hearted attempt, which he dismantled here.

Here's my attempt:

"The USA imposed a free trade agreement (NAFTA) on Mexico, which prevents the Mexicans from protecting and developing their fledgling economy. As a result, Mexicans are reduced to meeting the Americans' instatiable appetite for basic agricultural products. The USA deprives Mexico of the capital required for investment in modern hygienic farming methods, so Mexican pig-farming is very labour-intensive, which exposes the workers to a high risk of intra-species infection."

As this is a lefty theory, I haven't bothered backing this up with any facts or evidence (thus making it all the more difficult to refute).