Let me guess you didn't watch the analysis in the attached video.
OK, the short form is this.
Corn is one of the most energy/fertilizer/pesticide intensive crops to grow and harvest.
It takes even more energy to ferment and distill off the ethanol.
The fermentation effluent has little secondary use, and available need requires fresh product.
https://www.e-education.psu.edu/egee439/node/649In the end, the generation of ethanol for fuel consumes more energy than is present in the end product.
If it was economically feasible, the government wouldn't have to subsidize the effort.
Worst of all you have increased the cost of a bushel of corn, adversely impacting the nutritional intake of the less fortunate.