The author has a very good basic point. Farmers and the agribusiness industry do what they do not because they are evil but because customers want what they produce. This is often overlooked by those of us who criticize the current system of production. So we need to keep in mind that it is a system, and we all consume what this vast system produces, and we don't show any slackening of demand in the stuff we buy, particularly in the corn economy.
But the author's self interest gets a little heated, and he misses many of the points made in Omnivore's Dilemma (note the second word of the title and who it belongs to). There is a lot of exposition about the current financial structure of the industry with subsidies going to the small and huge family farms that actually provide significant benefit to the agribusiness and reduces the flexibility that the farmer might otherwise have regarding what to grow.
It is not useful, in my mind, to demonize the critics of our current way of business, nor is it useful to demonize the industry. This is a pretty complex problem.
As a former farmboy and current tech guy I found Omnivore's Dilemma to be quite evenhanded. This article is not. Both have good points worth contemplation.
Food is a huge ethical dilemma, and things are more interrelated than one might first think.