We cannot have the profits of our Most Holy Corporations drop. Cheap antibiotics will cause a drop in the Most Holy Profits of Our Sacred Corporations, and That Is Not Permissible.
How much profit is made by the misuse of antibiotics in animal rearing?
The opposite is true: with bacteria resistant to ancient antibiotics that are out of patent and work in weeks, the only alternative will be treatment for months or years with heavily patented drugs of dubious effectiveness and long hospital stays.
Is that your preferred outcome?
People, as a whole and on average, are terrible at judging long-term costs and overuse.
Now, if the product was priced to properly reflect negative externalities of use and abuse, maybe. But, that's not going to happen.
Because, you know, people are idiots and you know better.
So make them consult a well-paid and often clueless bureocrat before buying anything listed above. No prescription - no bottle.
The harms from antibiotic overuse don't go to the people doing the overusing.
You can try to limit animal antibiotics use but that industry can fight back.
People, you persuade. Nobody have to preserve your commons for you. If you want that field be green, what are you willing to spend?