It's entirely possible that the Smithfield facility at La Gloria had nothing to do with this outbreak. But it's not exactly a "wild theory" -- Smithfield pigs are being tested for the new H1N1 strain as I write this.
A deadly new influenza virus has managed to jump from pigs to people in a previously unseen mutated form that can readily spread among humans. How could this happen? There are several plausible explanations.