As far as ethnol from grains, I don't think anyone would be too happy if they stopped making whiskey, which is all that kind of grain is used for making, besides even more animal feed from the tailings.
As for Brazil sugar, yes, we have tariffs on buying quota's on sugar imports to force food makers to buy up American sugar. Currently there is a sugar shortage which is largely a fabricated shortage to try force those tariffs down. Brazil interestingly enough runs 80% of their vehicles on ethanol, and can still export billions of gallons of ethanol and tons of sugar if it were allowed into this country. Sad that consumers are screwed by our own government every way they turn, and are fed horse crap like 'food for fuel' and "cheap labor imports" nonsense as pacifiers.
Ethanol is stupid.
Ethanol causes inflation in food prices across the board.
Ethanol wastes massive quantities of water.
But, if we must be stupid, lets use pure sugar, at least!