Along with doing the same for billion dollar port and rail grain handling spin-offs.
Maybe not the farmers you're thinking of, but farmers in the world are.
If patents worked as a royalty system where you're guaranteed to get a license if you pay there would be no problem. But right now Bayer can use their control over Roundup Ready plants to make farmers buy more products they don't need, or punish them for dealing with competitors, because they have a monopoly.
And it also lets them set the price to anything they want because competing with them is illegal. Exclusive rights are always like that.
(Honeycrisp is another fantastically successful government-funded cultivar, this time by the University of Minnesota. But it apparently led to the spontaneous breeding of the SugarBee, which is privately owned.)
https://news.ycombinator.com/item?id=46176059
And another comment where I discuss another example and their legally binding declaration to not sue over accidental contamination: