If history tells me anything it's not to murder the people who grow your food. When the Soviet Union took control of the farming in Russia, they called the co-ops I think. The Russians nearly starved to death.
Whether or not this disease cluster was engineered, China will eventually become fully self sufficient and external trading partners will no longer be an impediment to invading Taiwan or the world.
They can be self-sufficent till the cows come home, but, without someone to buy their goods...they have no money to further their goal. Should we fall either through ethnic cleansing or an economic collapse...they will too.
Please, it is naive to think that a country can not engage in world war without simultaneously engaging in international trade. The trade occurs beforehand, in preparation for the war effort.
Civilian manufacturing would be redirected to war production similar to the WWII effort here. Lack of natural resources including petroleum would be an impediment to certain countries, but not China for a period of several months, once all civilian uses were restricted.
Once again, I am not arguing that this swine "flu" outbreak is bio-engineered. However, it is mysterious from a technical point of view and the Chinese government behavior is extraordinarily obfuscatory, even compared to the SARS situation. Whether or not the swine disease has military origins, I believe the Chinese would be willing to sacrifice a major fraction of their population in an assault on Taiwan and the west.
I agree that the Chinese Communist system would be unlikely to defeat the west, whether or not international trade is a factor. However, if the Chinese mounted a full war effort, many of us would be dead and those Americans surviving would find their lives greatly changed.