The Conservatism of Liberals

From Treehugger, a post on genetically modified sorghum in Africa. I can sort of understand opposition to GM that adds resistance to Roundup, or an insecticide, to a plant. Don't agree with it, but can understand it. I've big problems with opposition to modifying sorghum to have more nutrients or to make protein more digestible. Even if such traits do migrate to wild varieties of sorghum, I don't see the downside. Perhaps it would make wild sorghum better able to compete with other plants, because it's more valuable to animals?