I'm all for the elimination of subsidized biofuel. We can't afford it.
But, it is more impersonal than "farmers have been diverting more and more of their corn crops towards ethanol refineries." Farmer takes his corn to the granary. He may have someone he deals with. A broker who gets the best price he can for "x" amount of grain. Some of all of the farmers corn may go to biofuel, or it may go for human food, or the best price may be in livestock feeds. Lots of factors determine what it is best for, but in general the corn from several farms goes to one place and ends up all together.
There are also regulations regarding how much of the U.S. harvest can be used for biofuel, or how much can be sold outside the country. Foriegn countries also have limits and regulations.
I don't know if the author was ignorant of all that goes into selling a product like corn, or if the author is consciously wanting to portray farmers as greedy and uncaring.
Do farmers like that corn prices are very high compared to some years in the recent past? You bet. What business person wouldn't? Do they like that it is falsely supported by some silly government program? Most that I know care and don't like it and are saving and planning for when it ends, a few don't care and consider "the government" some not-quite-real entity that doesn't really affect them, and one says he really, really believes that biofuels are the answer to everything.