You are however pointing to the real problem which is: we're using land that should be used to grow food, to grow "fuel".
That's the problem right there.
It’s a matter of taste and cooking skills but field corn is quite edible. But most will go directly to silage and some to alcohol conversion where the leftovers go to supplement the silage and other ingredients. That helps to produce high quality milk at dairies or choice to prime meats at various finishing lots. It’s all good food!