Actually, a lot of those "people" are, at least in my social circle, actual veterinary doctors and agriculture technicians. As for large-scale farmers, this is a debate against their economic interest, boo-hoo. And there's economic reasons for feeding livestock antibiotics, and at least in legislations I know anything about it's only illegal for "organic" farming (though it does require veterinary supervision — but it doesn't have to be for health reasons unless it's "organic").
Notice the wording about "voluntary", and it's 2012. It was actually developed due to that "FUD" you're writing about. Note "Increase production by making the animal gain weight faster and by improving the animal’s ability to convert the food it eats (improved feed efficiency)."
You missed the part earlier in the article where it says that is not considered judicious use.
Also, you should understand what types of antibiotics are used in feed versus those that are used in treatment. The feed isn't some concoction of all antibiotics available on the market, and most food animal antibiotics aren't used in humans.
And if you really want to speak about regulations in US, an appropriate page is one Google away: http://www.fda.gov/AnimalVeterinary/GuidanceComplianceEnforc...
Notice the wording about "voluntary", and it's 2012. It was actually developed due to that "FUD" you're writing about. Note "Increase production by making the animal gain weight faster and by improving the animal’s ability to convert the food it eats (improved feed efficiency)."