The food system is a very complex beast. There are people who are going to get their food at Wal-Mart or at Safeway; they're not going to the farmers' market. Those people need choices too.
Studies show that organically grown crops produce more of the things (ascorbic acid, lycopenes, resveratrol, flavonols in general, etc) that our bodies need and also have less toxic residue. Science is still catching up with this. J. Agric. Food. Chem. Vol. 51, no. 5, 2003.
we ask for too much salvation by legislation. All we need to do is empower individuals with the right philosophy and the right information to opt out en masse. (quoting Joel Salatin)
Without such a thing as fast food, there would be no need for slow food,
We need to create incentives for our ranchers and farmers to manage their lands to maximize carbon sequestration.
The whole problem of industrial agriculture is putting all of your eggs in one basket. We need to diversify our food chains as well as our fields so that when some of them fail, we can still eat.