[I think you just argued that corn should be illegal because opium is.]
Depends how corn is used.
Opium is illegal because it is immoral to enslave someone via the tyranny of their own appetites.
It's hardly a new idea that the habits of the consumer public are deliberately manufactured.
Just ask...
George Orwell
Robert Heinlein
Joseph Conrad
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.
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George Lucas
Welcome to the hive of hypercapitalistic corporate communism.
Buy More, Bee Happy.