I think it was one of those "It was a good idea at the time" thoughts. The US before produced way more corn than they new what to do with. Corn was put in everything just so it could be used. ex. The typical McD chicken nugget is made with chicken and corn meal as a filler. Fried in corn oil, with batter made from corn starch. There is more corn in there than chicken
However, other countries don't have as much excess growing capacity, so while it was good money to produce corn for biofuels (and they got perks to do that), it was taking away resources for real food production, and hence food prices increased.
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