Earlier quoted context omitted.
Farmers massively administer antibiotics so they can keep animals in crowded/unsanitary conditions. If antibiotics were administered properly that would severely affect their revenue.
So just vote to outlaw antibiotics use in healthy livestock and make sure there is a rigorous inspection apparatus? Farmers are few, people who get diseases are many. Shouldn't be too hard.
"Concentrated benefits, dispersed costs." Farmers are highly organized and vigilant in defense of their subsidies and regulations, whereas sick people are not similarly organized and the policy connection to their condition isn't obvious. Concentrated benefits are what create special interests, which by their nature put their own interest ahead of the national interest.