It's pretty simple really, if ethanol was such a great thing there wouldn't be a need for government support. Also it's pretty clear that if farmers can choose between growing something people eat and growing something people don't eat but because of subsidies makes a better profit then the farmers will grow the something people don't eat. When the government gets involved it corrupts the value of things.
Farmers don’t get one dime in ethanol subsidies. The entire amount goes to the blender. Farmers were growing corn in abundance long before ethanol.
That’s why ethanol exists, because we overproduced so much farmers were desperate for an outlet to raise the price to make it profitable. Corn acreage didn’t increase because of ethanol. You have it backwards.